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  With the rapid development of 5G networks, the demand for network data transmission is increasing exponentially. As the underlying bearer network, the transmission capacity of optical networks is crucial to the development of 5G networks. One of the magic weapons to expand the transmission capacity of optical networks is to continuously dig deep into the available band resources of optical fibers, that is, to continuously expand the transmission path width of optical networks. The wider the transmission road, the transmission capacity of the optical network will naturally increase. Next, I will talk to you about these bands of optical fiber.   T raditional band As the name implies, optical fiber communication is the communication in which light is used as an information carrier and optical fiber is used as a transmission medium. However, not all light is suitable for fiber optic communication. Different wavelengths of light (which can be simply understood as light with diffe...

  In the field of optical fiber communication, Dispersion Compensation Module ( DCM ) (also called Dispersion Compensation Unit, DCU) is used to compensate dispersion, for example, to compensate dispersion in a very long transmission fiber. Usually, this module provides a certain dispersion (eg, normal dispersion in the 1600nm spectral region), although now there are also modules with tunable dispersion. Inserting the module into a fiber optic link is very simple as there are optical connectors at the input and output. A fiber amplifier can be used to compensate the insertion loss, for example, an erbium-doped fiber amplifier can be used in a 1500nm communication system. A dispersion compensation module is usually placed between two amplifiers.   The dispersion compensation module can be obtained by using the following techniques: 1. A common and simple method is to take a long piece of optical fiber, for example, dispersion-shifted optical fiber, and wind it on a bobbin with ...

  DWDM is a transmission technology in optical fiber communication. It uses one optical fiber to transmit multiple optical carrier signals of different wavelengths at the same time, and divides the wavelength range used by the optical fiber into several channels. The channel transmits optical signals. Therefore, DWDM has greatly improved the transmission capacity of the optical communication system. The appearance of Erbium-doped fiber amplifier ( EDFA ) makes DWDM optical signal transmission farther. 1. Introduction to the principle of EDFA Erbium (Er) is a rare earth element. When making an optical fiber, a certain proportion of erbium element is added to form an erbium-doped optical fiber, which has the effect of amplification. Erbium ions have three working energy levels: E1, E2 and E3. Among them, E1 has the lowest energy level and is called the ground state; E2 is the metastable state; E3 has the highest energy level and becomes the excited state. In the case of not being exc...

  Dense Wavelength Division Multiplexing ( DWDM ) is the ability to multiplex optical signals of different wavelengths into the same optical fiber for transmission. This is a technology used to increase bandwidth on existing fiber optic backbone networks. DWDM optical transmission system usually has the following optical devices: wavelength conversion unit (OTU), Wavelength division multiplexer (OMU/ODU, also called Mux/demux), Optical amplifier (BA/LA/PA), Dispersion compensation unit (DCM) The customer-side optical module passes through the OTU, and the wavelength is converted into DWDM light near 1550nm, and then enters the DWDM wavelength division multiplexer, where multiple lights of different wavelengths are combined on one optical fiber for transmission. , the optical power will drop, and it is necessary to increase the amplifier (BA/LA/PA) to make up the optical power. In the process of transmission, light is not always transmitted in a straight line. The farther the trans...

QSFP 40G LR4 optical module is widely used in 40G network, it includes two types of QSFP 40G LR4 CWDM optical module and QSFP 40G LR4 PSM optical module. What are CWDM and PSM? CWDM (Coarse Wavelength Division Multiplexing) refers to coarse wavelength division multiplexing. CWDM is a kind of WDM (wavelength division multiplexing). It can send and receive signals on multiple channels on a single optical fiber. It is usually used in communication networks. point-to-point structured wiring. PSM (Parallel Single Mode Fiber) refers to parallel single-mode fiber technology. Unlike CWDM optical modules that transmit or receive signals on multiple channels on a single fiber, PSM can simultaneously receive and send signals on four parallel fibers. Overview of QSFP 40G LR4 CWDM Optical Transceiver QSFP 40G LR4 CWDM module usually refers to QSFP+ 40G LR4 optical module, which has LC duplex interface, four independent transceiver channels, and each channel supports a rate of 10Gbps. In order to m...

  The BIDI optical module is a single-fiber bidirectional optical module, namely BiDi (Bidirectional). The conventional module is a dual-fiber module (connected by two optical fibers), and there are two optical fiber ports at the optical fiber interface: the transmitting port (TX) and the receiving port (RX), while the BIDI module is a single-fiber module with only one optical fiber port and one optical fiber port. Different optical signals are transmitted and received inside, so BIDI optical modules must be used in pairs. In terms of appearance, the BIDI module has only one port and is connected with only one optical fiber. The working principle of the BIDI optical module is to filter through the filter in the optical module (filter the unnecessary central wavelength), and complete the transmission of an optical signal of one wavelength and the reception of an optical signal of another wavelength at the same time. In order to achieve two-way communication, there must be The other...

With the rapid development of 5G, AI, big data, cloud computing and other services, the data center network is required to develop in the direction of high speed, high density, and efficient operation and maintenance. At present, 100G is widely used in China. This article introduces three mainstream solutions for 100G multimode optical modules. 1) 100G QSFP28 SR4 Interface type: multi-mode MPO-12F working principle: The center wavelength of 100GBASE-SR4 is 850nm, which can provide four independent transmission and reception channels, and the operating rate of each channel can reach 25G. The transmission distance is 70m when used with OM3 multimode fiber and 100m when used with OM4 multimode fiber. 2) 100G QSFP28 SRBD Interface type: multimode duplex LC working principle The transmission wavelength of the 100GBASE-SRBD optical module is 850nm and 900nm, and the SWDM wavelength division multiplexing technology is used to multiplex the optical signals of different wavelengths in the same...