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When the transmission capacity of a physical channel is higher than the demand for one signal, the channel can be shared by multiple signals, for example, the trunk line of a telephone system often has thousands of signals transmitted in a single fiber. Multiplexing is a technology to solve how t...

(1) AMI code AMI(Alternative Mark Inversion) code is the full name of alternate mark inversion code, its encoding rule is to alternately transform the message code “1″ (mark) to “+1″ and “-1″, while the “0″ (empty sign) remains unchanged. For exampl...

When we transmit a signal, whether it is an optical signal or an electrical signal or a wireless signal, if it is transmitted directly, the signal is susceptible to noise interference, and it is difficult to obtain the correct information at the receiving end. In order t...

The basic ways of binary digital modulation are: binary amplitude keying (2ASK)- the amplitude change of the carrier signal; Binary frequency shift keying (2FSK)- the frequency change of the carrier signal; Binary phase shift keying (2PSK)- Phase change of the carrier si...

WiFi is an international Wireless local area network (WLAN) standard, full name Wireless Fidelity, also known as IEEE802.11b standard. WiFi was originally based on IEEE802.11 protocol, published in 1997, defined WLAN MAC layer and physical layer standards. Following the ...

Optical eye image debugging Target: Extinction ratio Research and development stage: between 10-15 (large is better than small), according to the actual situation can be appropriate to improve the extinction ratio, but not too low. It's related to sensitivity. Quiver ...