Optical fiber communication 1第一节 Fiberoptic link Optical Sources LD-t-fibar Fiber modes. Attenuation Coupling Dispers ion. Non-linearifies Input Modu lator Laser/LED signa Fiber mponents Optical directional Repeater amplifier couplers spliC connectors Optical Amplifiers have many advantages over repeaters polarzation control lers Regenerators are specific to the modulaton format and bit rate amp lifiers Optical ampl ifiers are mostly insensitive to signal format and bit rate. filters so system upgrades are much less ex pens ive if OAs are used dispersion A single amp lifier has wide bandw idth and can amplify all the channels of a WDM signal simuitaneously compensators. switches OAs introduce addifional noise and distortion ( phase and amplitude OAs dont regenerate Im portant OAS: EDFAs, Raman semiconductor Output Detector Preamplifier Processing siona Photodetectors Thermal noise SNR Shot noise, RIN BER1 - 2 Copyright Wang Yan 2021/2/19 Optical fiber communications 第一节 Fiberoptic link