It builds the photon link between sender and receiver of quantum communication network, and provides quantum channel for transferring quantum information between them.

Design of optical fiber link ethernet for a port material transportation system;

We take the transmitting and receiving power of the optical communications equipment as the main discussion object and combine with practical project construction,the solution to the attenuation and amplification in optical fiber links with different distances are described.

This article analyses in theory the factors that affect the specifications of noise and nonlinearity in optical fiber link, gives the expressions of CNR、CSO and CTB as well as the results measured in practical optical fiber link from the headend of WHCATV to Jinghan Garden.

Optical Link Design Based on Java Applet;

By analyzing the circuit structure of a new product of optical receiver,calculating the C/N ratio of optical and electrical link under low power mode and high power mode respectively,a conclusion can be made that in high power mode,C/N ratio of both optical link and electrical link are relatively low,which means high power mode is generally not preferred.

In this article, a simplified formula for calculating C/N ratio of an optical link was suggested which can be applied to calculate the improvement of C/N index and CTB index of an optical link, in terms of the adoption of GaAs components and module as receiver module and amplifier module.