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  Synopsis The simultaneous transmission of two or more optical wavelength signals through different optical channels in the same optical fiber is called optical wavelength division multiplexing (WDM) technology. Reuse types Optical WDM includes frequency division multiplexing and WDM Optical frequency division multiplexing (FDM) technology and optical wavelength division multiplexing (WDM) technology have no obvious difference, because light wave is a part of electromagnetic wave. The frequency of light and wavelength has a single corresponding relationship. In general, optical frequency division multiplexing is a subdivision of optical frequencies. Optical channels are very dense. Wavelength division multiplexing (WDM) refers to the coarse division of optical frequency, the optical channels are far apart, and even in different Windows of the fiber. Structure Wavelength division multiplexer and demultiplexer (also known as combined wave/splitter) are placed on both ends of th...

OXC, the full name is optical cross-connect. Like ROADM, OXC is also an optical transmission device that can exchange optical signals between different optical paths. The concept of OXC actually existed as early as around 2000. In a sense, ROADM is a special implementation of OXC, and OXC includes ROADM. From the perspective of traditional architecture, OXC is composed of optical cross-connect matrix, input interface, output interface, management control unit and other modules. The optical cross-connect matrix is the core of OXC. The so-called matrix is actually a "box" with any internal ports interconnected in pairs. We will explain with the architecture of Huawei's OXC equipment. The OXC equipment is mainly composed of optical circuit boards, optical backplanes and optical tributary boards. Generally speaking, each slot of the circuit board corresponds to one direction. After the optical signal enters, it is "disassembled" into N wavelength signals through  WS...

A three-port filter for a specific wavelength of CWDM whose wavelength channel consists of two lenses and a TFF matched to that specific wavelength. The reflection port of each filter is connected to the common port of the next filter, and the filters are connected through optical fiber connectors, which is a CWDM multiplexer . The principle of CCWDM is to use the input lens to focus the optical signals with wavelengths λ 1, λ 2... λ n on the input fiber onto the first filter; the optical signal with wavelength λ 1 passes through the first filter and is coupled to the optical fiber via the first output lens. In the first output fiber, the optical signal with wavelength λ 1 is separated; the remaining optical signals are reflected from the first glass slide to the next glass slide for optical signal separation; and so on until all signals are separated. The coupling between wavelength channels is realized in the form of straight rays taking a zigzag route. HTF has achieved mass producti...