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Nonlinear modulation (Angle modulation)

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 to improve the anti-interfe... Read More

Binary Digital modulation

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 signal. Because of the phase... Read More

WIFI Technology Overview

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 802.11 protocol, many vers... Read More

Optical eye image debugging

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 Research and develo... Read More

The construction of the test environment

Core and principle of test environment construction: 1. Check whether the optical power exists Generally use optical power to test whether there is optical power; And the optical power of some ophthalmograms is -2dbm, -3dbm, etc. 2. Whether the clock is accurate The clock is the reference infor... Read More

Light eye map basic explanation II

A deep interpretation of jitter If the data rate of the system is increased, the jitter amplitude measured in a few seconds will remain roughly the same, but when measured in a fraction of the time of the bit period, it will increase proportionately with the data rate, resulting in bit errors. Th... Read More