What is WDM?
![](https://www.sekorm.com/front/website/images/sekormContent.jpg)
![](https://www.sekorm.com/front/website/images/sekormContent.jpg)
Wavelength Division Multiplexing (WDM) is a technique in fiber optic
transmission for using multiple light wavelengths to send data over the
same medium. Two or more frequencies of light can travel along one
fiber, and multiple signals transmit in an optical waveguide at
different wavelengths.
Fiber-optic transmission systems in the early stage load information to glass fiber with simple light pulses. The "on and off" of the light represents "0" and "1" in the digital world. Basically, from roughly 670nm to 1550nm, the light can be of any wavelength.
Fiber optical communications modems used low-cost LEDs to put near-infrared pulses onto low-cost fiber in the 1980s. The demand for information began to increase afterward, and so did the need for data bandwidth. Early systems delivered 155 Mbps data streams over very long distances with a 1310nm laser solution. However, the capacity was quickly exhausted. Advances in optoelectronic components over the years afterward allowed the design of systems that simultaneously transmitted multiple wavelengths of light over a very single fiber, so as to increase fiber capacity greatly. WDM was then brought to applications. Multiple high-bit-rate data streams of 10Gbps, 40Gbps, 100Gbps, 200Gbps, 400Gbps and more recently 800Gbps, can be multiplexed to a single optical fiber.
Two types of WDM:
Coarse WDM (CWDM): Generally, CWDM is defined by WDM systems with fewer than eight active wavelengths per fiber. CWDM is used for short-reach communications, so it's ok to employ wide-range frequencies with adjacent wavelengths spread far apart. Standardized channel spacing offers room for wavelength drift when lasers' temperature goes up and down during their operation.
Dense WDM (DWDM): DWDM is defined according to frequency. DWDM’s smaller wavelength spacing offers much more channels in a single fiber, while costs more to operate. DWDM is suitable for systems with more than eight active wavelengths over a single fiber.
Vendors have found various techniques for cramming 40, 88, or 96 wavelengths of fixed spacing into the C-band spectrum of fiber with WDM technology. Networks today with high-bandwidth applications and sustained bandwidth growth that are quickly facing capacity exhaustion turn to C+L-band solutions, which develop the L-band spectrum of a fiber to double the fiber capacity.
Optical networks evolve quickly to meet ever-increasing bandwidth demands. To take advantage of these benefits fully requires a flexible-grid line system that accommodates these higher-band channels (800G wavelength for example) that require more than 100GHz.
The next-generation coherent modems are smart and programmable that the modem considers a greater variety of band options, and it allows extremely granular tunability.
Boosted by EDF Amplifiers (EDFAs) and Raman amplification, the reach of these DWDM systems can be extended to thousands of kilometers. Highly precision filters are required to secure a specific wavelength from being interfered with by adjacent wavelengths. Also, DWDM systems must use precision lasers that operate at a constant temperature in order to keep channels on target.
One of the outstanding features of deploying DWDM in a flexible grid photonic system is signal independence. Based on this, many networks previously designed for 10Gbps and 40Gbps are able to carry 200Gbps channels, and many others deployed with flexible grid capability are now carrying 400Gbps and even 800Gbps signals.
T&S offers a wide range of solutions to address customer requirements, from the edge to the core, over a flexible range of platforms.
- |
- +1 赞 0
- 收藏
- 评论 0
本文由出山转载自T&S News,原文标题为:What is WDM?,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
相关推荐
Structures and Applications of Fiber Bragg Grating Sensors
A Fiber Bragg grating sensor can be used as a kind of fiber sensor. Like the optical fiber sensor, it has many irreplaceable advantages compared with the traditional electric sensor, such as no electromagnetic interference, lightweight, small size, no corrosion, etc.
技术探讨 发布时间 : 2023-09-19
Five Tests to Ensure the Fiber Patch Cord Quality
The quality of fiber patch cords affects the entire fiber-optic link. Each fiber patch cord must be strictly tested before leaving the factory. So what tests will a fiber patch cord manufacturer do to ensure the high quality of patch cords?
技术探讨 发布时间 : 2023-09-22
WDM Wavelength Division Multiplexing - Ideal for High-speed Optical Fiber Transmission Expansion
WDM (Wavelength Division Multiplexing) wavelength division multiplexing system mainly provides an easy-to-implement solution for long-distance transmission of high-speed and large-capacity information, which is convenient for the transmission expansion of communication networks.
技术探讨 发布时间 : 2023-08-26
Coherent Introduced 2x1000mW Dual-Chip Pump Laser Module for Optical Amplification in Optical Networks
Coherent, a leader in pump laser technology for erbium-doped fiber amplifiers (EDFAs) deployed in optical networks, today announced the industry’s first dual-chip pump laser module with up to 1000mW of output power per fiber in a 10-pin butterfly package.
厂牌及品类 发布时间 : 2023-09-05
Coherent Reports Significant Advancement in VCSEL Performance for Next-gen AI Networks
Coherent Corp. has made a significant breakthrough in improving the bandwidth of its vertical-cavity surface-emitting laser (VCSEL), paving the way for use in next-generation optical interconnects that will operate at 200 Gbps per lane and thereby enabling optical transceivers with 1.6 Tbps capacity.
厂牌及品类 发布时间 : 2024-03-29
Firecomms Fiber Optics for Consumer Network Applications
Firecomms fiber optic solutions are ideal solutions for high-bandwidth triple play networks that require Ethernet data to be transmitted across the home network. Together with Plastic Optical Fiber (POF), Firecomms’ fiber optic transceivers enable quicker, more flexible and cost-effective installations — unique advantage for home builders, installers, content providers, and consumers alike.
应用方案 发布时间 : 2024-07-09
Coherent Introduces Industry’s First 1200 mW Pump Laser Module for Optical Amplification in DWDM Networks
Coherent Corp announced the industry’s first pump laser module with 1200 mW of output power in a 10-pin butterfly package. The 1200 mW pump lasers provide the additional power needed to amplify the larger number of channels supported by these next-gen ultra-broadband optical transmission systems while meeting the stringent reliability requirements of these advanced networks.
产品 发布时间 : 2023-12-30
Selection and Detection of Fiber Optic Patch Cord
Fiber optic cable patch cord is widely used in communication rooms, home optical fiber, local area networks, optical fiber sensors, optical fiber communication systems, optical fiber connections, transmission equipment, etc.
设计经验 发布时间 : 2023-09-25
What is the Difference Between AOC and Optical Transceiver?
AOC active optical cable is an optical fiber with a module attached to each end, which is equivalent to a cable and a module.AOC active optical cable is also widely used by many customers because its cost is cheaper than that of two separate modules plus one optical fiber.
技术探讨 发布时间 : 2023-09-26
Detailed Introduction of Fiber Jumper Interface Types PC, APC, UPC
In order to make the end faces of the two optical fibers better contact, the ferrule end faces of the fiber jumpers are usually ground into different structures. Common grinding methods are PC, APC, UPC. PC/APC/UPC represents the front face structure of the ceramic ferrule.
技术探讨 发布时间 : 2023-12-08
The Optical Fiber Loss Budget and Influencing Factors
The link loss budget is estimated based on the amount of attenuation or signal reduction associated with the distance and number of connectors in the link. Before designing and installing an optical fiber link, we need to calculate the maximum loss caused by the path and connection.
技术探讨 发布时间 : 2023-08-24
Coherent Introduces I-Temp Micro-Pump Lasers for Extended Temperature Operation in Broadband Optical Access Networks
Coherent Corp. , a leader in pump laser technology for optical networks, today announced the introduction of its I-Temp micro-pump lasers for extended ambient temperature operation in broadband optical access networks.
产品 发布时间 : 2023-11-09
How to Achieve Precise Connection of Optical Fibers with Fiber Connectors?
When two optical fibers are connected, due to the difference in position, shape, and structure of the two optical fibers, the energy cannot pass 100% from one optical fiber to the other optical fiber, that is, connection loss occurs. To minimize connection losses, the two optical fibers must be precisely aligned.
技术探讨 发布时间 : 2023-09-10
Coherent Demonstrated Next-generation Transceiver and Semiconductor Laser Technology for 800G and 1.6T Transmission in AI Networks at ECOC 2023
Coherent Corp., a leader in optical communications components and subsystems,announced that it would demonstrate next-generation transceivers and laser technology for 800G and 1.6T datacom transmission at ECOC 2023 in Glasgow, Scotland, October 2-4, stand #406.
厂牌及品类 发布时间 : 2023-10-24
Is 200G Active Optical Cable Good? What Are the Advantages?
In recent years, optical networks have developed rapidly. In order to ensure the stability and flexibility of transmission, users, and manufacturers require a newer type of transmission product to achieve higher-performance signal transmission. To meet this need, active optical cable (AOC) appeared.
技术探讨 发布时间 : 2023-09-21
电子商城
现货市场
登录 | 立即注册
提交评论