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  by www.fiber-mart.com When selecting optical modules, we should not only consider the stability and reliability of optical module functions, but also consider the price and quality, as well as whether they meet the requirements of network equipment compatibility and data transmission. Here, fiber-mart.com will introduce which optical module parameters should be explained to the manufacturer when selecting the optical module, hoping to be helpful to you.     1. Interface Rate   Before selecting the rate of an optical module, you need to confirm the rate supported by the switch port, and then select the rate of the optical module based on the rate supported by the switch. The rates of optical modules can be FE(155M), GE(1.25G), 10GE, 25GE, 40GE, 100GE, or 400GE. In addition, there are commonly used for storage network (SAN) fiber channel 8G, 16G rate (widely used by Brocade devices)   2. Transmission Distance   Optical modules with different rates, waveleng...

  MM fiber Concept   MM fiber is a fiber that transmits multiple modes at a given working wavelength. When the geometric size of the fiber is much larger than the wavelength of the light wave, there will be dozens or even hundreds of propagation modes in the fiber. Different propagation modes have different propagation velocities and phases, resulting in time delay and widening of optical pulses after long-distance transmission. Therefore, the bandwidth of MM fiber will be narrowed and its transmission capacity will be reduced, so MM fiber is only suitable for optical fiber communication with small capacity.   SM fiber Concept   Generally, when V is less than 2.405, only one wave peak passes through the fiber, so it is called a SM fiber. Its core is very thin, about 8-10 microns, and the modal dispersion is very small. The main factor affecting the bandwidth of optical fiber transmission is various dispersion. The dispersion of SM fiber is small, so it can transmit l...

 After a optical module is made into a finished product, it must go through multiple steps of testing before shipment that ensure the quality of the product. In the test, several parameters are very important. Only when these parameters meet the relevant standards, the optical module performance can be optimized. These parameters include: transmitted optical power, receiving sensitivity, bias current, saturated optical power, extinction ratio, and operating temperature. First we need to understand what is the transmitted optical power . The transmitted optical power refers to the output optical power of the optical source at the transmitting end of the optical module, it taking dBm as the unit. It is an important parameter of the optical module and will directly affect the quality of the network communication. What are the causes of poor power of optical transceiver? v Power does not match with resistance v Defective patch or poor performance of drive chip   v Poor transm...

  10G SFP+ CWDM optical transceiver is a kind of coarse wavelength division multiplexing optical transceiver, usually used with single mode optical fiber. This kind of optical transceiver uses the CWDM technology to save optical fiber resources, which significantly improves networking flexibility, economy, and reliability. Moreover, the optical transceiver has very low power consumption. The wavelength interval of the CWDM optical transceiver is generally 20nm. The CWDM technology solves the two problems of optical fiber shortage and transparent multi-service transmission. It is mainly apply to the convergence or access level of medium and shortdistance’s MAN. The CWDM optical  transceiver uses DFB laser, which does not need to use EDFA as optical amplifier. The device is cheap, and the CWDM modulation laser uses uncooled laser, which does not need to be cooled. When the temperature changes from 0 to 70℃, the wavelength of the laser changes about 6nm. Considering the discrete...

 As the conversion equipment of photoelectric signal, optical fiber media converter has become one of the important technical equipment in the field of social communication. Optical fiber media converter is a kind of communication equipment which can convert short distance Ethernet electric signal and long distance optical signal. One end of it is optical fiber interface and the other is Ethernet interface. The emergence of optical fiber media converter is to make up for the problem of short transmission distance of network cable (the maximum is no more than 100m). In the application scenarios such as school, residential area, high-rise building and commercial square, it is impossible to only use network cable to wire, which requires optical fiber to extend the transmission distance. Therefore, optical fiber media converter (photoelectric converter) was born. Optical fiber media converter has the characteristics of wide frequency band, low loss, short delay, reliable performance, l...

Optical fiber media converter is also known as optical-to-electrical converter, its function as converting the optical and electrical signal. The transmission process is roughly: the electrical signals are converted into optical signals, transmitted through optical fibers, and then the optical signals are converted into electrical signals at the other end, and then connected to routers, switches and other devices. In practical application, the biggest function of optical fiber transceiver is to extend the transmission distance. The following fiber-mart.com will briefly introduce the optical fiber media converter and its use. Because the network cable (twisted pair) we often used, its maximum transmission distance is limited, the general twisted pair of the maximum transmission distance is 100 meters. Therefore, when we deploy large networks, we have to use relay equipment. Of course, optical fiber can also be used for transmission, because the transmission distance of optical fiber is ...

In this article, fiber-mart.com will introduce to you, what is the difference between active optical cable(AOC) and direct attach cable(DAC)? First, the AOC is composed of integrated optoelectronic devices. The signal transmission process is that the A terminal module converts the electrical signal into an optical signal, the optical signal is transmitted to the B terminal module by an optical fiber patch cord, and the B terminal module converts the optical signal into an electrical signal. In contrast to this, the DAC direct connection cable uses silver-plated conductors and foamed insulated core wires as materials, and adopts wire-pair shielding and general shielding. The transmission signal is an electrical signal, and there is no photoelectric signal conversion process. In this article, fiber-mart.com will introduce to you, what is the difference between active optical cable(AOC) and direct attach cable(DAC)? First, the AOC is composed of integrated optoelectronic devices. The sign...

 DAC high-speed cable is a low-cost and short-distance connection solution for data center equipment. It consists of a cable and optical fiber transceiver devices at both ends of the cable. Because of the high cost performance, the interconnection application between short-distance network equipment is widely welcomed. At present, there are many specifications of DAC high-speed cables on the market. If you want to buy a cost-effective high-speed cable product, fiber-mart.com summarizes the following considerations for everyone here. 1. There are two types of high-speed cables, active and passive. The difference between the two is that the active DAC high-speed cable has an additional driver chip. At the same time, active optical cables do not need power supply skills to display their characteristics, while active optical cables require external power to display their characteristics. Under normal circumstances, when the transmission distance exceeds 5 meters, in order to reduce the...

 The English translation of high-speed cable is Direct Attach Cable, or DAC for short. This article will introduce several key factors that affect the transmission performance of DAC high-speed cable. 1. Cable attenuation Cable attenuation refers to the reduction or loss of signal energy that occurs during the transmission of information to the device through the cable. During the transmission of high-speed cables, as the frequency increases, the attenuation will increase. In addition to the increase in frequency attenuation, temperature will also increase the attenuation of the cable. For every 10°C increase in temperature, the signal attenuation of the cable will increase by 4%. 2. Cable crosstalk Crosstalk is also an important factor affecting cable performance. Crosstalk is a harmful interference signal, which comes from the coupling effect between pairs. This type of noise will cause random changes in signal amplitude, which will limit the receiver's ability to monitor changes...

 1. Lower fiber loss OM5 is the name given to a new type of broadband multimode fiber, with attenuation reduced from 3.5 dB/km to 3.0 dB/km for previous OM3 and OM4 fibers, and additional bandwidth requirements at 953nm wavelengths. The geometry of OM5 (50μm core and 125μm cladding) is the same as that of OM3 and OM4, making it compatible with these types of fibers downward. 2. Support higher bandwidth applications OM5 optical fiber also supports future 400G Ethernet, for faster 400G Ethernet applications such as 400G Base-SR4.2 (4 pairs of optical fibers with 2 wavelengths, 50G PAM4 per channel) or 400G Base-SR4.4(4 pairs of optical fibers with 4 wavelengths, 25GNRZ per channel), Only 8-core OM5 optical fiber is required. OM5 optiacl fiber is a laser-optimized multimode fiber (MMF) that has specified bandwidth characteristics for wavelength division multiplexing (WDM). The aim of this new optiacl fiber classification method is to support a wide range of "short" wavelengths b...

 In this blog, fiber-mart.com will introduce what is 10G SFP+ CWDM optical transceiver, and what are its advantages. 10G SFP+ CWDM optical transceiver is a kind of coarse wavelength division multiplexing optical transceiver, usually used with single mode optical fiber. This kind of optical transceiver uses the CWDM technology to save optical fiber resources, which significantly improves networking flexibility, economy, and reliability. Moreover, the optical transceiver has very low power consumption. The wavelength interval of the CWDM optical transceiver is generally 20nm. The CWDM technology solves the two problems of optical fiber shortage and transparent multi-service transmission. It is mainly apply to the convergence or access level of medium and shortdistance’s MAN. The CWDM optical  transceiver uses DFB laser, which does not need to use EDFA as optical amplifier. The device is cheap, and the CWDM modulation laser uses uncooled laser, which does not need to be cooled. W...

 POE optical fiber media converter is one of the common equipment to build enterprise POE network architecture. It can use the existing unshielded twisted pair wiring to power the network equipment. In this article, ETU-LINK will introduce you the application scenarios of POE optical fiber media converter? Poe optical media converter is a photoelectric converter with power over Ethernet (POE) function. It can supply power to remote IP cameras, wireless devices and VOIP phones through network cables, eliminating the trouble of installing power cables separately. Common POE optical fiber media converter in the market are usually configured with one RJ45 interface and one SFP interface. Other POE optical fiber media converter will be configured with duplex RJ45 interface and duplex optical fiber interface to support the use of fixed optical fiber connectors or SFP optical modules. POE optical fiber media converter can be applied to wireless access points, IP cameras and VOIP phones. T...

 POE optical fiber media converter is one of the common equipment to build enterprise POE network architecture. It can use the existing unshielded twisted pair wiring to power the network equipment. In this article, ETU-LINK will introduce you the application scenarios of POE optical fiber media converter? Poe optical media converter is a photoelectric converter with power over Ethernet (POE) function. It can supply power to remote IP cameras, wireless devices and VOIP phones through network cables, eliminating the trouble of installing power cables separately. Common POE optical fiber media converter in the market are usually configured with one RJ45 interface and one SFP interface. Other POE optical fiber media converter will be configured with duplex RJ45 interface and duplex optical fiber interface to support the use of fixed optical fiber connectors or SFP optical modules. POE optical fiber media converter can be applied to wireless access points, IP cameras and VOIP phones. T...

 As a member of the new QSFP28 family, the 100G QSFP28 SR4 optical module is a very ideal solution in the short distance transmission of 100g network. The application of 100G will be more and more put into the actual environment. So what is the connection solution of 100G QSFP28 SR4 and what fields are it applied in? ETU-Link will unveil it for you. Technology development of 100G optical module Compared with 2.5G, 10G or 40G WDM systems, 100G optical transmission uses digital coherent receiver to map all optical attributes of optical signal to the electric domain through phase diversity and polarization state diversity. Using mature digital signal processing technology, polarization demultiplexing, channel damage equalization compensation, timing recovery, carrier phase estimation, symbol estimation and linear decoding are realized in the electric domain. While realizing 100G optical transmission, a series of significant technical changes have taken place in 100G optical module, in...

 Need of optical fiber amplifiers  An optical amplifier solves the traditional distance problem as in anylong-distance telecommunication system such as a trans-Atlantic link. Due to optical signals traveling through the fiber, the signals become weaker in power. The farther you go, the signals become weaker till it gets too weak to be reliably detected. With the help of fiber amplifiers fiber optic communication systems solve this problem along the way. An optical fiber amplifier is an optical device purely. It never converts the incoming optical signal to an electronic signal at all. You can even call it an in-line laser. Dozens of optical channels can be simultaneously amplified by an optical fiber amplifier as they separately do not convert each channel into electronic signals. The optical switch isalso useful. Optical fiber amplifiers and how do they work An optical fiber amplifier is a section of optical fiber that with a rare-earth element such as erbium or praseodymium ...

 Splitting an incident light beam into two or more light beams or vice versa, Fiber optic splitter or referred to as beam splitter is a passive optical component. Multiple input and output ends are present in a fiber splitter. For the convenience of network interconnections in a network, a fiber optic splitter is implemented whenever there is a requirement of the division of light transmission.  Working of Fiber Optic Splitter   Whenever there is the transmission of the light signal in a single-mode fiber, the light energy is not able to concentrate in the fiber core. Through the cladding of fiber, a small amount of energy is spread. The light-transmitting in a fiber adapter can enter into another optical fiber now if two fibers are enough for each other. Therefore, in the optical signal, the reallocation technique can be achieved in multiple fibers.  Classification of Fiber Optic Splitter: There are two types of fiber optic splitter, one is a PLC splitter anoth...