Understanding OLT, ONU, ONT and ODN

by Fiber-MART.COM

In recent years, Fiber to the Home (FTTH) has started to be taken seriously by telecommunication companies around the world, and enabling technologies are being developed rapidly. There are two important types of systems that make FTTH broadband connections possible. These are active optical networks (AON) and passive optical networks (PON). By far the majority of FTTH deployments in planning and in deployment use a PON in order to save on fiber costs. PON has recently attracted much attentions due to its low cost and high performance. In this post, we are going to introduce the ABC of PON which mainly involves the basic components and related technology, including OLT, ONT, ONU and ODN.

 

First of all, it is necessary to have a brief introduction of PON. In contrast to AON, multiple customers are connected to a single transceiver by means of a branching tree of fibers and passive splitter/combiner units, operating entirely in the optical domain and without power in PON. There are two major current PON standards: Gigabit Passive Optical Network (GPON) and Ethernet Passive Optical Network (EPON). But no matter which type of PONs, they have a same basic topology structure. A Gigabit Ethernet Passive Optical Network (GEPON) system is generally composed of an optical line terminal (OLT) at the service provider’s central office and a number of optical network units (ONUs) or optical network terminals (ONTs) near end users, as well as the optical splitter. In addition, the optical distribution network (ODN) is used during the transmission between OLT and ONU/ONT.

 

Optical Line Terminal (OLT)

OLT is a equipment integrating L2/L3 switch function in GEPON system. In general, OLT equipment contains rack, CSM (Control and Switch Module), ELM (EPON Link Module, PON card), redundancy protection -48V DC power supply modules or one 110/220V AC power supply module, and fans. In these parts, PON card and power supply support hot swap while other module is built inside. The main function of OLT is to control the information float across the ODN, going both directions, while being located in a central office. Maximum distance supported for transmitting across the ODN is 20 km. OLT has two float directions: upstream (getting an distributing different type of data and voice traffic from users) and downstream (getting data, voice and video traffic from metro network or from a long-haul network and send it to all ONT modules on the ODN.

 

Optical Network Unit (ONU)

ONU converts optical signals transmitted via fiber to electrical signals. These electrical signals are then sent to individual subscribers. In general, there is a distance or other access network between ONU and end user’s premises. Furthermore, ONU can send, aggregate and groom different types of data coming from customer and send it upstream to the OLT. Grooming is the process that optimises and reorganises the data stream so it would be delivered more efficient. OLT supports bandwidth allocation that allows to make smooth delivery of data float to the OLT, that usually arrives in bursts from customer. ONU could be connected by various methods and cable types, like twisted-pair copper wire, coaxial cable, optical fiber or Wi-Fi.

 

Optical Network Terminal (ONT)

Actually, ONT is the same as ONU in essence. ONT is an ITU-T term, whereas ONU is an IEEE term. They both refer to the user side equipment in GEPON system. But in practice, there is a little difference between ONT and ONU according to their location. ONT is generally on customer premises.

 

Optical Distribution Network (ODN)

ODN, an integral part of the PON system, provides the optical transmission medium for the physical connection of the ONUs to the OLTs. Its reach is 20 km or farther. Within the ODN, optical fibers, fiber optic connectors, passive optical splitters, and auxiliary components collaborate with each other. The ODN specifically has five segments which are feeder fiber, optical distribution point, distribution fiber, optical access point, and drop fiber. The feeder fiber starts from the optical distribution frame (ODF) in the central office (CO) telecommunications room and ends at the optical distribution point for long-distance coverage. The distribution fiber from the optical distribution point to the optical access point distributes optical fibers for areas alongside it. The drop fiber connects the optical access point to terminals (ONTs), achieving optical fiber drop into user homes. In addition, the ODN is the very path essential to PON data transmission and its quality directly affects the performance, reliability, and scalability of the PON system.

 

Conclusion

There are different types of OLT, ONU, ONT equipments for GEPON, which are the new generation PON equipments and mainly applied by telecommunication operators in FTTH project. All these equipment are provided in fiberstore and have the characteristic of high integration, flexible adaption, reliability and capable of providing QOS, web-management as well as flexible enlarging capacity. For more information, please contact us over sales@fiber-mart.com.

FTTH Deployment for MDUs

by Fiber-MART.COM

Today, many people live in MDU (Multi-Dwelling Units) such as apartments, condos and student-housing, especially in the large cities. As the demand for HDTV, video, picture sharing, online game keeps increasing, higher bandwidths and faster network speed are required. As fiber connections can bring fast and reliable service to millions of households, so the service providers decide to invest on fiber network service in such high-density markets to get rich returns. Then how to deliver the high quality fiber network service to MDUs?

 

What Should Be Considered Before Deployment?

Before taking fiber deployment for MDUs, the service providers should better make a fiber network design. As we know, a poor network design can cause a failure of delivering the network service from providers to users. To make a perfect plan, many factors should be taken into considerations. The following will tell you those factors.

 

New Building or Old Building

Maybe this factor has the greatest influence on the deployment strategy. Is it a new building? Or does MDU already exist? New buildings are often called greenfield. It’s good to simplify FTTP (Fiber to the Premise) network deployment as it provides easy access to cable pathways and relative flexibility in conduit placement for the network design. While it’s another situation in the old buildings (also called brownfield). Because the existing infrastructures that are hard to change bring inflexibility to installers. More costs will be spent on the materials and labors.

 

MDU Types

 

MDU type is another factor impacting the deployment on the methods taken and materials employed. Generally there are three categories of MDU buildings.

 

Low-rise MDU. This kind of buildings always refers to townhouse or condominiums which have at most three floors in height with the maximum of 12 units per building. And the entry ways to residents are usually outside of the structure. Therefore, low-rise MDU makes it more possible to deploy fiber to each single family.

Mid-rise MDU. Mid-rise MDUs are typically multi-level structures with entries inside, including two-story apartments, small multi-tenant services, and nursing homes. About 12 to 128 residential units live in this building.

High-rise MDU. This type of buildings has multiple stories (usually more than 10 stories), where more than 128 residential units live. As the same to mid-rise MDU, entry ways are inside the structures. So installers often deal with the network deployment in the same way to mid-rise MDUs.

ONT Types

In an FTTH deployment, ONT (Optical Network Terminals) type and its location is very important to long-term maintenance and operational costs. ONT can be divided into two types. One is SFU (single-family unit) ONT for SFUs or MDUs and the other MDU ONT specially designed for MDUs. Both types can be applied in brownfield. And SFU ONT devices are often used in greenfield MDUs because an MDU ONT must share network with other residential units.

 

Which type is more suitable for FTTP deployment? Pay attention to two points. First, it’s about the cost. It will cost more to deploy several individual electronic devices rather than a single one to deliver broadband services within a building. And more drop cables will also increase the cost as each SFU ONT requires a single-fiber drop cable. But less money will be spent on copper cable. Comparatively, an MDU ONT can be fed with a single fiber drop cable, but the final link to the residential unit needs copper cables. So the cost will be very high if there are lots of units to be served and more copper cables are required from the horizontal to each unit. Second, consider the network speed and security. An SFU ONT can provide high bandwidth, while an MDU ONT must share bandwidth with other subscribers it serves. The following two figures show two ways to deploy fiber into a mid- to high-rise MDU.

 

Conclusion

Since more people live in MDUs, network service provider can make a big profit from supplying a large number of end customers within a small area. Because the cost is relatively low to deploy FTTH in MDUs compared to individual residences. How to save as much cost as possible during MDU FTTH deployment? Well, it depends on the building situations, MDU type, ONT type, etc. And required network devices are also important. Fiberstore offers all equipment for MDU FTTH deployment, such as ONT, fiber drop cable, Ethernet copper cable and so on. For more details, please visit www.fiber-mart.com or contact us via sales@fiber-mart.com.

Do You Know about SMF&MMF 40G QSFP+ Transceiver?

by Fiber-MART.COM

There is a growing need in the data center for upgrading from 10G to 40G switch connections due to server consolidation, virtualization, and performance improvements. However, for many data center operators this upgrade and conversion is more challenging based on two primary factors. First, the potential for a reconfiguration of the physical layer of the network based on the reduced reach of the OM3/OM4 multimode optics from 10GBASE-SR (300/400 m) to 40GBASE-SR4 (100/150 m) and second, the existing fiber optic cabling plant may need to be upgraded based on the additional fiber count needed to support the IEEE-defined 40GBASE-SR4 parallel optics. These two factors bring the SMF&MMF 40G QSFP+ transceiver to market.

 

What Is SMF&MMF 40G QSFP+ Transceiver?

 

As we all know, a fiber optic transceiver may either operate on multimode fiber (MMF) or single-mode fiber (SMF). However, a SMF&MMF 40G QSFP+ transceiver can be used with both MMF and SMF without the need for any software/hardware changes to the transceiver module or any additional hardware in the network. Usually, this transceiver is based on IEEE defined 40GBASE-LR4 specifications and operates in the 1310 nm band. It uses a duplex LC connector and supports distances up to 150 m over OM3 or OM4 multimode fiber and up to 500 m over single-mode fiber (different vendor may have different specifications). This is usually accomplished by combining four 10G optical channels at different wavelengths (1270, 1290, 1310, and 1330 nm) inside the transceiver module to transmit and receive an aggregate 40G signal over a single pair of multimode or single-mode fibers. At present, there are two main SMF&MMF 40G QSFP+ transceiver in the market. One is the Arista QSFP-40G-UNIV universal QSFP+ transceiver, and the other is the Juniper JNP-QSFP-40G-LX4 40GBASE-LX4 QSFP+ transceiver. These two types QSFP+ for both MMF and SMF are widely installed and used for upgrading from 10G to 40G networks without modification or expansion.

 

Advantages of SMF&MMF 40G QSFP+ Transceiver

With the increase in data center bandwidth requirements, migration to 40G for switch to switch connections is in higher demand. SMF&MMF 40G QSFP+ transceiver is designed to allow for seamless migrations from existing 10 to 40GbE networking without requiring a redesign or expansion of the fiber network. Besides, this transceiver also provides a cost-effective solution to migrate from multimode to single-mode fiber, allows a single-mode fiber infrastructure for distances up to 500m. The advantages of SMF&MMF 40G QSFP+ are as following.

 

Cabling Migrating from 10G to 40G

Existing 40G transceivers for short reach, QSFP+ SR4 and the extended reach QSFP+ CSR4, utilize four independent 10G transmitters and receivers for an aggregate 40G link, which use an MPO-12 connector and require 8-fiber parallel multimode fiber (OM3 or OM4). However, a SMF&MMF QSFP+ uses duplex LC connector, which is consistent with the existing 10G connections, which are also commonly MMF cables with duplex LC connectors. Therefore, a SMF&MMF QSFP+ allows the same cables to be used for direct 10G connections to direct 40G connections, resulting in zero-cost cabling migration.

 

Increase Number of 40G Links in the Network

As existing MMF 40G solutions need the use of 8 fibers for a 40G link, customers have to add additional fiber to increase the number of 40G links. By deploying the SMF&MMF 40G QSFP+ transceiver, customers increase the number of 40G links by 4 times without making any changes to their fiber infrastructure, which greatly expand network scale and performance.

 

Migrate from Multimode to Single-mode Fiber

As data rates increase from 40G to 100G and beyond to 400G, there is a strong desire for data centers to move to single-mode fiber for cost effectiveness. Due to the limitations of multimode transceivers to support existing distances with ever increasing data rates, migrating to 100G and 400G in the future will be simpler with single-mode fiber. However, the single-mode transceivers typically cost up to 4 times more compared to multimode transceivers. As SMF&MMF QSFP+ interoperates with 10km QSFP-LR4 optics, it s a cost effective solution for SM fiber infrastructure for distances up to 500 m.

 

Simplify the Data Centers with a Mix of MMF and SMF Deployments

The SMF&MMF 40G QSFP+ transceiver offers the unique advantage of operating on both multimode and single-mode fiber without any requirement for additional hardware or software. Customers can consolidate their optics and use SMF&MMF QSFP +in their network irrespective of the fiber type, which makes full use of the existing cabling systems, reduces the cost of deployment and of support, and simplify purchasing and deployments.

 

Conclusion

The SMF&MMF 40G QSFP+ transceiver enables data centers running at 10G today to seamlessly upgrade to 40G without having to re-design or modify the cable infrastructure, which allows organizations to migrate their existing 10G infrastructure to 40G at zero cost of fiber and to expand the infrastructure with low capital investment. It also offers a transition path for customer planning migrations to single-mode fiber in data centers with a single transceiver that bridges the gap between multi-mode and single-mode optics. With high-density 40G switches on hand, Fiberstore SMF&MMF 40G QSFP+ transceiver provides a cost-effective solution for migrating to next-generation 40G data center deployments.

Transceiver Optics and Connection for Brocade 7840 Extension Switch

by Fiber-MART.COM

Today’s IT organizations are under pressure to keep pace with the growing avalanche of data traffic between data centers and the changes driven by virtualized application workloads within Fibre Channel and IP storage environments. Storage administrators need to replicate large amounts of data quickly, securely, reliably and simply while minimizing operational and capital expenses. To address this challenge, the Brocade 7840 extension switch with Brocade fabric vision technology delivers unprecedented performance, strong security, continuous availability, and simplified management to handle the unrelenting transfer of data between data centers.

 

Brocade 7840 Extension Switch Overview

Designed for high-speed, secure transport of data between data centers while maintaining uptime, the Brocade 7840 is an ideal platform for building a high-performance data center extension infrastructure for replication and backup solutions (see the picture below). It leverages any type of inter-data center WAN transport to extend open systems and mainframes storage applications over any distance. Without the use of extension, those distances are often impossible or impractical.

 

The picture above shows that the Brocade 7840 provides scalable deployment options to extend multiprotocol disaster recovery and data protection storage solutions over long distances. Besides, the Brocade 7840 addresses the most demanding disaster recovery requirements. Twenty-four 16G Fibre Channel/FICON ports, sixteen 1/10G ports, and two 40G ports provide the bandwidth port density, and throughput required for maximum application performance over WAN connections. The following picture illustrates the Brocade 7840 switch ports and status indicators.

 

1.System (SYS) status LED

 

2.Power (PWR) LED

 

3.USB port

 

4.Ethernet management (mgmt) port

 

5.Serial Console management port

 

6.Twenty-four Fibre Channel ports: with link speeds of 2, 4, 8, and 16 Gbps, compatible with short wavelength (SWL), long wavelength (LWL) and extended long wavelength (ELWL) SFP+ transceivers (available wavelength options vary for 8 and 16Gbps SFPs) and capable of auto-negotiating to maximum link speed).

 

7.Two 40G ports: compatible with short reach (SR) and long reach (LR) QSFP+ transceivers.

 

8.Sixteen 1/10G ports: For 10 Gbps, compatible with ultra short reach (USR), short reach (SR) and long reach (LR) SFP+ transceivers; For 1 Gbps, compatible with -SX, -LX, and -CX (copper) SFP transceivers.

 

Connection Option for Brocade 7840 Extension Switch

The connection option for Brocade 7840 extension switch can be various. The following picture shows an example of 10G to 40G migration connection between two Brocade 7840 extension switches.

 

1. 10GBASE-SR SFP+, 850nm 300m, MMF, LC duplex

 

2. 8 Fibers OM4, 12 Strands MTP Harness Cable, MTP Female to LC UPC Duplex, Polarity Type B

 

3. 1U Rackmount FHD Series Fiber Enclosure, Loaded with 4 FAPs (12xMTP Key-up/Key-down)

 

4. 12 Fibers OM4, 12 Strands MTP Female to Female, Polarity Type B, 0.35dB Trunk Cable

 

5. 40GBASE-SR4 QSFP+, 850nm 150m, MMF, MTP/MPO Interface

 

Transceiver Optics for Brocade 7840 Extension Switch

The Brocade 7840 extension switch has been enhanced to support IP, as well as Fibre Channel, to provide fast and secure connectivity for IP storage between data centers, enabling organizations to better meet their disaster recovery objectives. It offers both 40G and 10G Fibre Channel over IP connectivity options. The following table lists the transceivers supported for Brocade 7840 extension switch.

 

Conclusion

The Brocade 7840 extension switch is a purpose-built extension solution that securely moves more data over distance faster while minimizing the impact of disruptions. The transceiver optics supported for Brocade 7840 are all available in fiber-mart.COM. Moreover, all of the transceivers are tested to ensure good performance.

Basic Knowledge About GPON SFP Transceivers

by Fiber-MART.COM

GPON stands for Gigabit Passive Optical Network. GPON is one of the key technologies that are being used in fiber-based (FTTx) access networks, including fiber to the home (FTTH), fiber to the business (FTTB), fiber to the curb (FTTC), etc. GPON system contains two main active transmission components, namely optical line termination (OLT) and optical network termination (ONT) or optical network unit (ONU). Modern OLT and ONT/ONU use compact fiber optic modules to achieve the triple-play GPON services. These modules are known as GPON SFP transceivers. This post will give a comprehensive introduction to GPON SFP modules.

 

What Is GPON SFP?

GPON SFP is one type of gigabit optical transceivers that are used in GPON system, which is compliant with ITU-T G.984.2 standard. It is a bidirectional module that has SC receptacle and works over simplex single-mode fiber optic cable. A GPON SFP module transmits and receives signals of different wavelengths between the OLT at the Central Office side and the ONT at the end users side. GPON SFPs utilize both the upstream data and downstream data by means of Optical Wavelength Division Multiplexing (WDM).

 

GPON SFP: Class B+ vs. Class C+

GPON SFP transceivers are categorized into GPON OLT SFP and GPON ONT SFP or GPON ONU SFP depending on the devices they are used in. And there are Class B+ GPON SFP and Class C+ GPON SFP. The major differences between them are the transmit power and the receive sensitivity. The table below lists the Tx power and Rx sensitivity of Class B+ GPON SFP and Class C+ GPON SFP.

 

By using Class B+ or Class C+ GPON OLT SFP, it can support up to 32 or 64 ONTs at customer premises respectively. And a C+ OLT SFP can be used with B+ ONT SFP as long as the loss budget of the link is appropriate.

 

How’s the GPON SFP Different From Conventional BiDi SFP?

Although GPON SFP belongs to the gigabit BiDi SFP family, it differs from “normal” BiDi SFPs in some aspects. Here’s a comparison between GPON SFP transceiver and conventional BiDi SFP transceiver.

 

Signal Transmission Mode

In terms of conventional gigabit BiDi SFP transceivers that are mainly used in backbone network, the optical transmission mode is point to point (P2P), i.e., they must be used in matched pair. A BiDi usually has LC receptacle instead of SC receptacle. Here’s an illustration of P2P transmission mode.

 

The transmission mode of GPON SFP is point to multi-point (P2MP). One GPON OLT SFP at the Central Office communicates with multiple GPON ONT SFPs with the help of fiber optic splitters. This is why we usually see a GPON infrastructure is in a tree shape or a tee shape.

 

Transmission Distance

The transmission distance of conventional gigabit BiDi SFP can be up to 160 km over single-mode fiber cable when using 1590nm/1510nm and 1510nm/1590nm wavelengths. GPON OLT and ONT/ ONU SFP transceivers support a transmission distance up to 20 km with 1490nm/1310nm and 1310nm/1490nm wavelengths.

 

Benefits of Using GPON SFP

Using GPON SFP is considered a more convenient and cost-effective solution for the end customers. And it also reduces the devices that need to be provided by the Internet service provider (ISP). Before the GPON ONT SFP was released and used in GPON networks, the ISP usually needs to install at least an optical modem (a type of ONT with a fiber optic port) and an IP access router, and a Set-Top-Box or video recorder might also be needed if IPTV services are required. The separation of different devices inevitably increased the cost for GPON services.

 

The newly used GPON SFP is in smaller size and integrates the triple-play services. It has lower consumption as well. The ISP provides a GPON ONT SFP to the customer. This module is usually installed in the hub/router handed to the customer by the ISP. The customer is also able to unplug the fiber optic patch cable and the GPON ONT SFP from the ISP’s hub/router, and then plug them in his own router/switch that is white-listed by the ISP.

 

Conclusion

GPON SFP transceivers are typically used in the two main active transmission components OLT and ONT/ONU in GPON optical networks. They are essential in keeping the high-bandwidth communication between the service provider and the end users over a distance up to 20 km. GPON SFPs are classified into Class B+ and Class C+ and the main differences are their Tx power and Rx sensitivity. This module has simplified the implementation of GPON services. It benefits both the service providers and the end users to some degree.

Optics and Cabling Options for Juniper EX2200 Switches

by Fiber-MART.COM

The soaring bandwidth requirements lift demand for ultra fast transmission speed, especially for high-performance business. Juniper EX2200 switches present an ideal option for access-layer deployments in branch offices and campus networks, delivering performance usually associated with more expensive products. EX2200 switches are low power, low acoustic 1U devices designed for wiring closet, making them an economical solution for low density access business needs. This article offers cabling and connectivity solution for Juniper EX2200 switches.

 

Juniper EX2200 Switches Overview

High-performance businesses demand high-performance networking solutions. Juniper Networks EX2200 Ethernet switches offer an economical, entry-level, stand-alone solution for access-layer deployments in branch and remote offices, as well as campus networks. The EX2200 also supports Juniper Networks Virtual Chassis technology, allowing up to four interconnected switches to be managed as a single logical device, delivering a scalable, pay-as-you-grow solution for expanding networks.

 

Features and Highlights of Juniper EX2200 Switches

Featuring complete layer 2 and basic layer 3 switching capabilities, Juniper EX2200 switches satisfy the branch and low-density wiring closet connectivity requirements of today’s high-performance businesses. Four platform configurations are available offering 24 and 48 10/100/1000BASE-T ports with or without Power over Ethernet (PoE). Juniper EX2200 generally offers a compact, high-performance solution for supporting today’s converged network access deployments. The following are the main features of EX2200 switches:

 

Four front panel small form-factor pluggable transceiver (SFP) GbE uplink ports provide high-speed connectivity to aggregation layer switches or other upstream devices.

Uplink ports can be configured as Vitual Chassis interfaces and connected via standard GbE optics interfaces. The last two uplinks are preconfigured by default as Vitual Chassis ports.

Low power consumption, low acoustic fans, and a small 10-inch wide footprint enable flexible, environmentally friendly deployment.

 

Integrates with Juniper Networks Unified Access Control to provide per-user access control and policing.

Built-in web interface.

 

Juniper EX2200 Switches Architecture

The EX2200 occupies a single rack unit, delivering a compact solution for crowded wiring closets and access locations where space and power are at a premium. The EX2200 switch’s 10-inch depth and low acoustics also make it ideal for open office deployments. Each EX2200 switch supports four fixed front panel GbE uplink ports with pluggable optics (purchased separately) for high-speed backbone or link aggregation connections between wiring closets and upstream aggregation switches.

 

Models and Configurations Analysis

The EX2200 offers 24 or 48 10/100/1000BASE-T port models, with EX2200-24T and EX2200-24P for 24 port model, while EX2200-48T and EX2200-48P offers 48 ports. Power over Ethernet (PoE) is only available in EX2200-24P and EX2200-48P models.

 

EX2200-24T

Juniper EX2200-24T model contains 24 10/100/1000BASE-T Gigabit Ethernet ports, and 4 built-in SFP uplink ports.

 

Conclusion

The EX2200 line provides a high-performance solution for converged networks in branch offices as well as campus wiring closets. fiber-mart.COM offers all above Juniper EX2200 switches compatible transceivers with affordable prices and high performance. All those products are tested before shipping to ensure superior quality. For more details, please visit www.fiber-mart.com or contact us via sales@fiber-mart.com.

 

40CH DWDM Mux Insertion Loss Testing

by Fiber-MART.COM

DWDM, which can add great capacity of bandwidth for long haul backbone data center by multiplexing different wavelengths into one fiber, is one of the dominant technology used in various applications. When purchasing a DWDM Mux Demux, one of the vital parameters that need to be considered is the insertion loss. Higher insertion loss means more investment in DWDM network deployment. This post focuses on the insertion loss testing of 40CH DWDM Mux to offer some help for your DWDM Mux Demux purchase.

 

Understand DWDM Mux Insertion Loss

As its name shows, insertion loss is the total optical power loss (often measured by dB) caused by the insertion of an optical component. Any component in a fiber optic interconnection will introduce loss definitely. For example, insertion loss of a connector or splice is the difference in power that we can see when inserting the component into the system. The insertion loss is affected by the fiber core meter on the transmit and receive end, as well as the receive conditions in two joint fibers.

 

In a completed network, the total loss comes not only from the optical connectors, but also from optical cables and the diverse ports of optical components inserted. As we all know, there are several types port on 40CH DWDM Mux Demux: line port, channel port and monitor port, some Muxes may have other function ports like 1310nm port, 1510nm port and expansion port. No matter which type of ports is connected to a DWDM system, some insertion loss occurs. Therefore, in order to ensure good performance of a whole DWDM optical link, a high quality DWDM Mux Demux should have a reasonable insertion loss value.

 

Insertion Loss Comparison in Different Vendors

If you are familiar with DWDM Mux Demux, you may know how great impact the insertion loss of them has on the whole network links. The higher the DWDM channel insertion loss is, the more cost may be needed, for optical amplifiers are required to keep a balance signal power in the link. And there are many vendors and suppliers of 40CH DWDM Mux in the market. Here is a graph showing the maximum insertion loss value of 40CH DWDM Mux of different vendors.

 

In a DWDM networks, the budget loss mainly comes from optical fiber path loss, DWDM OADM and Mux/Demux. If the loss of them is high, the network deployment cost will get higher certainly. In this graph, the vertical axis stands for the max insertion loss, and the horizontal axis shows several DWDM Mux vendors or suppliers like Cisco, Finisar, MRV, fiber-mart.COM, etc. From this comparison, we can see all the max insertion loss of 40CH DWDM Mux are not very high. The max insertion loss of MRV is 7.5dB, Cisco is 6.5dB and Finisar is 5dB. But compared with these vendors or suppliers, fiber-mart.COM 40CH DWDM Mux has the lowest max insertion loss—4.5dB. Besides, the typical insertion loss of fiber-mart.COM 40CH DWDM Mux is only 3dB. All these indicate that fiber-mart.COM 40CH DWDM Mux is perfect for long haul DWDM transmission.

 

How to Do Insertion Loss Testing for 40CH DWDM Mux Demux

Since insertion loss has profound influence on the whole optical networks, knowing how to test the insertion loss of 40CH DWDM Mux Demux is important. And the testing can be finished with an optical power meter if no professional equipment is available. Here offers a video to illustrate the insertion loss testing of our 40CH DWDM Mux, which uses Cisco Catalyst 4948E switch and our Cisco C25 compatible 10G DWDM SFP+ and C60 DWDM SFP+ modules that support 80km as light sources. This testing just takes channel 25 port and channel 60 port as examples to explain the testing method.

 

Summary

High quality, low insertion loss 40CH DWDM Muxs can not only manage bandwidth and expand capacity of existing optical backbones, but also save cost in DWDM network design. fiber-mart.COM 40CH DWDM Mux is a high density, low insertion loss passive modules, providing an ideal solution for DWDM networks. Custom services are also available. If you are interested, welcome to visit our website www.fiber-mart.com or contact us via sales@fiber-mart.com for more detailed information.