What Is WDM and DWDM?

DWDM/CWDM Platform

SINTAI DWDM/CWDM platform consists of optional 1U (OTNS8600 I), 2U (OTNS8600 II), 5U (OTNS8600 V) chassis for WDM products, providing a powerful platform for any type of optical networking application.

 

Types of DWDM and WDM Platform

1U Platform

01- 1U Platform

The 1U transponder WDM system has 4 slots for service and management cards, which is mainly used in the metropolitan area access layer network.

 

02- 2U Platform

The 2U wdm transmission device has 8 slots for service and management cards, which are mainly used in metropolitan area nodes.

 

03- 5U Platform

The 5U WDM system has 16 slots for service and management cards, which has the biggest capacity for network expansion.

 

What is WDM In Networking

 

Multiplexing optical signals of different wavelengths into the same optical fiber for transmission, we call the method or technology wavelength division multiplexing (WDM).

 

Wavelength division multiplexing system is a technology that combines two or more optical carrier signals of different wavelengths at the transmitting end through a multiplexer, namely a type of wdm equipment, and coupling them to the same optical fiber for transmission; at the receiving end, the optical carriers of various wavelengths are separated by the demultiplexer, and then further processed by the optical receiver to restore the original signal. This technology of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing.

 

Classification of wavelength division multiplexing (WDM) system

 

Opening system: Generally, WDM systems have (Optical Transponder Unit) OTU to convert optical signals of non-standard wavelengths of client equipment into optical signals with standard wavelengths that comply with ITU-T G.694.1 or ITU-T G.694.2 recommendations.

 

Integrated system: Another WDM system does not require OTU. The optical port of the client-side equipment (such as a switch) can be equipped with a standard wavelength division optical module, and the luminous signal of the client-side equipment is directly connected to the multiplexing and demultiplexing unit (MDU) of the WDM system.

 

What is CWDM and DWDM In Networking

Coarse Wavelength Division Multiplexer (CWDM) is a low-cost WDM transmission technology for the access layer of the metropolitan area network. Dense Wavelength Division Multiplexing (DWDM) is to combine a group of optical wavelengths and use a single optical fiber for transmission.

 

Difference between CWDM and DWDM

DWDM transmission technology is more expensive than CWDM, as it requires more stable wavelength sources. The increasing cost of the DWDM transmitter is mainly due to the high cost of the laser diodes, and the feedback cooling operation to maintain the wavelength stability. And that's the reason why the price of WDM devices vary.

 

 

Differences between DWDM and OTN

1. Dense wavelength division multiplexers (DWDM) :

 

DWDM, which stands for dense wavelength division multiplexing, is a technique for sending multiple strands of data over a single network link. At the transmitter, an optical multiplexer brings together two or more optical signals of different wavelengths.

 

At the receiver, optical demultiplexers are used to separate the signal, which inevitably causes signal loss, but it can be mitigated by optical amplifiers.

 

Thus, DWDM connections can be used to transmit data over long distances because it can increase the bandwidth of existing fiber networks.

 

2. Optical transport network (OTN) :

 

OTN stands for Optical Transport Network and provides a network framework that adds SONET/ SDH capabilities to WDM devices such as performance monitoring, fault detection, communication channels, and multiplexing structure .

 

It works in layer 1 and brings various tasks together into the tunnel of WDM technology, increasing the transmission distance and capacity of the optical fiber.

 

This means that OTN frame architecture combines the flexibility of SDH/SONET technology with the bandwidth scalability of DWDM to provide delivery, multiplexing, routing, management, regulation and survivability of optical channels carrying customer signals.

 

Optical transport networks are designed to provide a transparent framework to efficiently carry different traffic types, which can reduce ACPEX/OPEX in the network while addressing sharp changes in traffic types.

 

In short, the allure of OTN can be translated into two words: transparency and manageability.

 

3. Differences between DWDM and OTN

 

DWDM is a point-to-point system, while OTN consists of an optical crossover connector (OXC) and an optical split-and-insert multiplexer (OADM) with features such as optical crossover capability and wavelength conversion. Developed on the basis of DWDM technology, OTN aims to optimize existing transportation network resources. In addition to providing large capacity DWDM transmission, OTN also allows switching different DWDM channels according to traffic needs.

 

In addition, because it has been proved to use fiber optic cable and extract the data stream, so people pay more attention to the data on the DWDM link security, by contrast, otns channelizing link and effective will flow into a dedicated circuit with a high degree of privacy and security, can prevent some parts into the network hackers to intercept the data or access to other areas.

 

It can be seen that OTN networks outperform DWDM networks in terms of enhanced OAM, security and wavelength networking capabilities, standard multiplexing hierarchies, and end-to-end optical transmission transparency for customer traffic.

 

DWDM and OTN are the topics discussed in this paper and are of interest to those who want to make better use of them and deserve further exploration. While there are indeed differences between OTN and DWDM, these two technologies are irreplaceable and have become key points in the telecommunications infrastructure of regional networks by allowing bandwidth to exceed existing networks.

 

DWDM/CWDM Transport Advantages

01

Arbitrary service access

Deliver any service, any protocol, any card with speed. Eliminate networking headaches with solutions that are simple to deploy and operate with future-ready architectures.

 

02

Smooth upgrade and expansion

As long as the number of multiplexing optical channels and devices is increased, the transmission capacity of the system can be increased to achieve expansion, and the expansion will not have adverse effects on other multiplexing optical paths. Therefore, the upgrade and expansion of the WDM system are smooth, convenient, and easy, so as to maximize the protection of the initial construction investment.

 

03

Transparent transmission of each channel

The multiplexing channels of the WDM system are independent of each other, so each channel can transparently transmit different service signals, such as voice, data, and image, which will not interfere with each other. It can bring great convenience to users.

 

04

Super capacity transmission

The transmission capacity of the WDM system is very large. Because the multiplexing optical channel rate of WDM system can be 10, 25, 100, 200 Gbit/s, and the number of multiplexing optical channels can be 4, 8, 16, 32, or even more, the transmission capacity of the system can reach as much as 19.2 Gbit/s.

 

WDM Transport System FAQs

 

What is DWDM and how it works?

Dense Wavelength Division Multiplexing (DWDM) is an optical multiplexing technology used to increase bandwidth over existing fiber networks. DWDM works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber.

 

What is the difference between DWDM and CWDM?

CWDM has a wider channel spacing than DWDM. CWDM systems can carry 18 channels. DWDM systems, on the other hand, can carry 40, 80, 96 wavelengths by utilizing a much narrower spacing of 0.8/0.4 nm (100 GHz/50 GHz grid).

 

How many lambdas are there in DWDM?

DWDM (dense wavelength division multiplexing) is the technology for projecting multiple lambda circuits on fiber strands. Currently, 96 lambdas per fiber is common.

 

As a wdm supplier, we will do our best to meet all the needs of customers.

 

If you want to know more kinds of dwdm products, please visit our website.

 

tunable dispersion compensator

tunable chromatic dispersion emulation

tunable chromatic dispersion emulator and tunable dispersion compensator

 

 

TDCM

Dispersion is one of the transmission properties of the optical fiber, and the optical pulse signal will be broadened in time after transmission in the optical fiber for a distance, which produces inter-symbol interference, thus increasing the error rate and affecting the quality of communication. The tunable dispersion compensation module (TDCM) is created to solve this problem.

 

Types of TDCM

Tunable Dispersion Compensation Card

01- Tunable Dispersion Compensation Card

Tunable chromatic dispersion compensation line card uses fiber as the underlying technology to achieve tunability, which allows it to be unlocked from a specific 100/50 GHz grid-like fiber grating and etalon technologies require.

 

TDCM Applications

 

Chromatic dispersion is an important factor in the performance of fiber optic communications systems. It is a topic and performance characteristic that is important to be understood and accounted when operating and/or designing TDCM equipment for fiber-based networks.

 

With different colors of the light spectrum travelling at different speeds due to the differences in refractive index, in the figure above red light travels faster than blue, due to its lower index. Over distance, red and blue will be further separated, thus the signal will be broadened.

 

Over longer distances, this small "dispersion" eventually adds up to a degree that the receiving end cannot properly distinguish between two consecutive signals as the pulses start to overlap. If not managed, this can cause serious trouble in network communication systems, especially in fast bit rate applications.

 

TDCM (Tunable Dispersion Compensating Module) is a method using electronic filtering to compensate for dispersion in an optical communications link. It is suitable for high-speed, long-distance WDM transport systems. A key component enabling this adaptability is the tunable dispersion compensator. It can be included in a communications channel to compensate for signal degradation caused by the medium and has the ability to adjust the dispersion compensation value according to the characteristics of the optic fiber, which can the signal transport in long distance in a good way.

 

TDCM Advantages

Sintai TDCM is a tunable, fully integrated compensator that provides accurate dynamic control of chromatic dispersion for a variety of applications. This advanced tunable dispersion compensator leverages fiber-bragg grating (FBG) technology, which provides a broad dispersion range and operational bandwidth. Our TDCM instrument is featured with the fiber-bragg grating (FBG) technology, which has a broad dispersion range and operational bandwidth. It is available in card type and rackmount versions. The control software interface and hardware button allow for easy integration and minimal setup time for experimental configurations. Sintai TDCM has the following advantages:

 

• Adjustable

 

• ± 1200ps/nm dispersion tuning

 

• Flat Transmissivity

 

• Multi-channel colorless ITU grid operation

 

• Low latency

 

• Low insertion loss, tuning power, and polarization dependence

 

• G.652 slope matching

 

• Multi-channel

 

• The dispersion compensation range is large

 

• Transparent and does not change the optical signal.

 

• Simple structure

 

• Convenient maintenance

 

• Safe and reliable

 

TDCM FAQs

What is dispersion compensation module?

In optical fiber communications, dispersion compensation modules (DCM) (also called dispersion compensation units, DCU) can be used for compensating the chromatic dispersion of, e.g., a long span of transmission fiber. A dispersion-compensating module is often placed between two fiber amplifiers.

 

How can we reduce dispersion?

One way to decrease chromatic dispersion is to narrow the spectral width of the transmitter. Lasers, for example, have a more narrow spectral width than LEDs. A monochromatic laser emits only one wavelength and therefore, does not contribute to chromatic dispersion.

 

What do you mean by zero dispersion fibers?

A wavelength where the group delay dispersion of a fiber or a material is zero. Categories: general optics, fiber optics and waveguides. Formula symbol: λ0.

 

How does a tunable chromatic dispersion emulation module work?

A dispersion compensating module (or DCM) is used to compensate the cumulative dispersion in a single-mode fiber and a dispersion coefficient is used to characterize the dispersion value. The value for regular SMF is around +16~17 ps/(nm*km) at 1550nm.

 

What is TDCM in WDM?

The TDCM (Tunable Chromatic Dispersion Compensating Module ) is used to compensate dispersion for optical signals. For WDM: DCM modules are installed in DCM frames and are used to compensate for the positive dispersion of transmission fibers to help maintain the shape of a propagated signal. It is very flexible in the application with varible values.

 

As a qualified fiber optic products supplier, Sintai is dedicated to providing integrated optical transport network (otn) systems and offering optimization solutions to optical communication problems of the customers.

 

If you want to know more kinds of optical communication devices, please visit our website.

 

 

 

What Is Semiconductor Optical Amplifier

SOA Semiconductor Amplifier

SOA is used for amplifying an optical signal. SOAs are included in the optical transceiver modules used for communication between data centers to amplify the optical signal in the 1.3 um band used for Ethernet communication in order to compensate for transmission loss.

 

Types of Semiconductor Optical Amplifier

1 Channel 40G&100G SOA Amplifier

01- 1 Channel 40G&100G SOA Amplifier

A semiconductor optical amplifier (SOA) can be used in an array of applications such as wavelength conversion, signal regeneration, pulse reshaping, and power limiting.

 

2 Channels 40G&100G SOA Amplifier

02- 2 Channels 40G&100G SOA Amplifier Optical

SOA has been deployed in a wide spectrum of high-speed applications from long-haul to metro and access optical networks. 4 Channels 40G&100G SOA Amplifier.

 

4 Channels 40G&100G SOA SFP Amplifier

03- 4 Channels 40G&100G SOA Amplifier

SOA is commercially available in different form factors in accordance with the application and requirements.

 

SOA Semiconductor Amplifier FAQs

 

What is SOA Semiconductor amplifier?

An SOA (Semiconductor Optical Amplifier) is a semiconductor element that amplifies light. ... When light enters the semiconductor from the outside, it is amplified through stimulated emission by the semiconductor amplifier. Moreover, the applications of semiconductor optical amplifiers span across optical signal amplification, wavelength division multiplexing, and advanced optical network switching.

 

What is crosstalk in SOA in optical fiber?

A simple theory for the crosstalk in multichannel wavelength-division multiplexing (WDM) communication systems caused by the cross gain saturation in semiconductor optical amplifier (SOA) is developed.

 

Which pumping is used in SOA?

We have demonstrated an all-optical S- to C/L-band wavelength up-conversion scheme for non-return-to-zero data using an optically pumped semiconductor optical amplifier (SOA). The 1480-nm input signal directly pumps the SOA and modulates its gain.

 

If you want to know more about semiconductor optical amplifier working principle and application of semiconductor optical amplifier, please visit our website.

 

Sintai is committed to providing a variety of optical transport network systems and WDM equipment. Fibre optical communication system and optical communication devices are widely used by telecom operators and customers from private network industry, including ISP, electric power, IDC, education, radio and television, network security, big data and cloud services, etc.

 

Now price of dwdm transponder is reasonable, anything you need, please contact us.

 

 

Designed for Ethernet, Fiber Channel, SDH, SONET, CPRI, or OTN links over duplex single-mode fibers, the Sintai DWDM 10G SFP+ optical transceivers use DWDM C-band C15-C62 wavelengths with 100GHz spacing and support transmission distance up to 80km.

 

10G SFP+ DWDM Transceiver Feature

Adopt SFP+ hot-swappable encapsulation with LC interface.

 

Support an overall rate of 1.06Gb/s~11.3Gb/s with service compatibility.

 

Support specification of DWDM.

 

Suitable for networks such as Ethernet/ FC/ SDH/ SONET/ CPRI/ OTN.

 

Single-mode optical fiber supports a transmission distance of up to 80km in the DWDM system.

 

Built-in DDM (digital diagnostic monitoring function).

 

Working temperature: 0°C ~ +70°C.

 

Comply with RoHS standards.

 

DWDM 10G Transceiver Overview

The 10G SFP+ optical communication module launched by Sintai Communication Co., Ltd is specifically designed for 10G Ethernet and 1G/2G/4G/8G/10G Fiber Channel applications, and it is compatible with STM-16/64, CPRI 2~8, OTU1/2, and other network applications.

 

The module conforms to the MSA protocol and supports an adaptive rate of 1.06Gbps~11.3Gbps, with the longest transmission distance of 80 km, complying with the RoHS standard and supporting digital diagnostic function.

 

The China DWDM optical transceiver is used in the DWDM system which adopts the dense wavelength division multiplexing technology to achieve long-distance and huge capacity transmission.

 

10G SFP+ DWDM Transceiver Specification

 

As a 10g cwdm xfp optical module supplier, we will do our best to meet all the needs of customers.

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