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Where DWDM Use?

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  DWDM is often used by telecommunications, cable and data centers as part of their optical transport network.   Carrier Transport Network The carrier transport network is made up of several layers of aggregation called the access network, metro aggregation network, edge network and the core backbone network. DWDM is most often used in the metro aggregation network and the core backbone network.   DWDM in the metro aggregation network is used to combine data from several cities. As service providers bring more computing capabilities closer to their customers, DWDM is also flexible enough to meet their needs for higher bandwidth aggregation as they begin to converge more data into a single node to compute. The core backbone often deals with the high-speed switching of large amounts of data between their major central offices, which can span across several regions, states or even countries, which is also ideal for using DWDM.   If need more information, welcome to contact HTF. www.htfu
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The signal transmission process when making a phone call

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In modern society, mobile phones have become an indispensable communication tool in our daily lives. When we dial a phone number and talk to relatives and friends far away, there is actually a series of complex and sophisticated working principles hidden behind it. Do you know how signals are transmitted when you are talking to relatives and friends? The first step in a mobile phone call is the transmission of the signal. When the call is connected, the mobile phone will continue to send signals to the nearby base station, telling the base station to transmit the signal. The base station will transmit the signal to the nearest data center, and then pass the signal through the aggregation layer, backbone network, and core network. After being transmitted, it passes through the core network, backbone network, aggregation layer, and base station, and then the signal is delivered to the target mobile phone. As shown in the figure below, in the process of signal transmission, DWDM optical t
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Data Center Network

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  1. Internal network of data center Different types of applications have different requirements for  data center networks . The front end network usually adopts TCP protocol, and IP/ Ethernet network technology becomes the mainstream of  the front end network , with low cost and good scalability. Storage networks have been pursuing large bandwidth and high throughput to maximize disk and CPU efficiency. FC technology with higher Ethernet speeds over the same period was adopted in the late 1990s. In the 20th century, with the scale application of higher speed SSDS, especially the recent emergence of NVMe technology with high speed and low latency, storage requires faster and more efficient networks. The computing network mainly adopts InfiniBand private network, which is typically represented by HPC and other high-performance services. Low delay is its ultimate pursuit. However, with the development of RoCE technology, Ethernet has been widely used in computing network. In view of th
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Introduction To The WDM

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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 the optical
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Exploring The Wonders Of OTN - Optical Transport Network

With the explosion of digital traffic and the ever-growing array of bandwidth-hungry applications, Optical Transport Network (OTN) evolves from point-to-point DWDM remedies to scalable and robust optical networking applications that cater to a wide variety of client signals with equally-varied service requirements. Carriers are also placing a particular emphasis on OTN in the Metro area, where it is shifted rapidly from SONET/SDH to Wavelength Division Multiplexing (WDM). With the goal of boosting bandwidth and increasing network functionality, OTN provides a way to support different traffic types in a more cost-effective manner than by using SONET/SDH networks. What Is OTN Network? Defined by the ITU Telecommunication Standardization Sector (ITU-T), OTN is a digital wrapper technology that provides an efficient and globally accepted way to multiplex different services onto optical light paths. The OTN technology or digital wrapper technology provides a network-wide framework that add
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Optical Transceiver 1310nm fail to transmiss on G.655 optical fiber

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  Have you ever encountered the problem that the link cannot be   up when the 1310nm optical module is transmitted on G.655 optical fiber? I encountered this kind of problem recently, and now I want to share it with you . Failure symptom Module ： 100G QSFP28 1310nm 80km optical transceiver Switch ： Cisco NCS540 Optical fiber type:   G.655, distance 50km Failure symptom:   Transmission link cannot go up. Analysis: 1.Change another switch, the link continues flap 2.Use G.652 optical fiber test in lab, Link works ok. Optical module Tx power and Rx power are in spec. That means optical transceivers performance are ok. 3.DWDM optical modules work well on G.655 link ， that means G.655 link no break.   4 . Deduce ： The optical module wavelength and fiber type don’t match Root Cause: Optical  modules with a working wavelength of 1310nm cannot use G . 655 optical fiber for long-distance transmission , G.655 Optical cable cutoff wavelength  ≤ 1480nm, work window is C band and L band (1530nm~16
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WDM Transmission Solution

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There are CWDM/DWDM/LWDM always in optical communication industry, Wavelength Division Multiplexing ( WDM ) is a fiber-optic transmission technique that enables the use of multiple light wavelengths (or colors) to send data over the same medium. Two or more wavelengths can travel on one fiber, and several signals can be transmitted in an optical waveguide at differing wavelengths or frequencies on the optical spectrum. Advances in optoelectronic components allowed the design of systems that simultaneously transmitted multiple wavelengths of light over a single fiber, significantly increasing fiber capacity. Then, WDM transmission was applied. Multiple high rate data streams of 10 Gb/s, 40 Gb/s, 100 Gb/s, 200 Gb/s and more recently, 400 Gb/s and 800 Gb/s, each carrying distinct throughputs, can be multiplexed over a single fiber. There are three types of WDM defined by ITU-T: Coarse WDM (CWDM): CWDM is defined by WDM systems with fewer than 18 active wavelengths per fiber, from 1270nm t
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