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  The qsfp transceivers  is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic device includes transmitting and receiving parts. The transmitting part is: input the electrical signal with a certain code rate, and then drive the semiconductor laser (LD) or light-emitting diode (LED) to emit the modulated optical signal with the corresponding rate after being processed by the internal driving chip. It has an optical power automatic control circuit to keep the output optical signal power stable. The receiving part is: the optical signal of a certain code rate is input into the qsfp optical module  and then converted into an electrical signal by the light detection diode. Ⅰ. Classification of optical transceivers: (1) According to the speed: 100Base (100M), 1000Base (Gigabit), 10GE for Ethernet applications; 155M, 622M, 2.5G, 10G for SDH applications. (2) According to the package: 1×9, SFF, SFP, GBIC, XENPAK, XFP and SFP+, QSFP, QSFP+. So, to

  What are the basic components of IoT? To answer this question, this article introduces the relative analysis and knowledge in detail, hoping to help you to solve the question in a simpler and easier way. Ⅰ. What are the basic components of IoT? IoT can be roughly classified into the following four levels: sensing layer, network layer, platform layer and application layer. The details are as follows. 1. Sensing and Identification Layer The sensing layer is the foundation of the overall framework of IoT, and is an important link between the physical the information world. In this layer, we can sense the object and its surroundings through sensors. In this way, the object is given the ability to speak and release information, such as sound sensors, pressure sensors, photoelectric sensors and so on. The sensing layer is responsible for collecting information for IoT. 2. Network Construction Layer As a linking component, this layer is responsible for transmitting the sensory information t

  Fixed optical attenuator  is an optical device that can reduce the energy of optical signal. Through the attenuation of input optical power, it can avoid the distortion of optical receiver due to too strong input optical power. As an optical passive device, fiber attenuator is usually made of attenuation fiber with metal ions. It can adjust the optical power to the required level. It is mainly used in optical communication system to debug the optical power performance, calibrate the calibration of optical fiber instrument and reduce the attenuation of optical fiber signal. 1. Why use fiber optic attenuators? The intensity of optical signal received by various optical receiving equipment is limited, and the equipment can not work normally if the optical power is too weak or too strong within a certain range. When the optical power is too strong, the optical power will be adjusted by light attenuation to reduce it to an appropriate range, otherwise even if the equipment can be used, it