Title :
Time-delays in microstructures and stability-problems in ultra-high speed amplifiers for optical WANs
Author_Institution :
Dept. of Comput. Sci., Ruhr-Univ., Bochum, Germany
Abstract :
The paper describes the decrease of stability in optical WAN-data amplifiers (beyond the the current standard of about 10 GB/s) with over-all negative feedback caused among others by phase shifting and time-delay depending on geometric lengths in the circuit lay-out. The interdependencies between open loop and closed loop gain will be shown in the cases of a transimpedance stage (TIS) and an unity gain amplifier (EF) with an inner transistor amplification of gi,DC=10 and a cut-off frequency of f0=10 GHz
Keywords :
closed loop systems; delays; feedback amplifiers; operational amplifiers; optical communication equipment; optical fibre networks; wide area networks; circuit lay-out; closed loop gain; closed loop systems; cut-off frequency; inner transistor amplification; microstructures; open loop gain; optical WANs; over-all negative feedback; phase margin; phase shifting; stability-problems; time-delays; transimpedance stage; ultra-high speed amplifiers; unity gain amplifier; Circuit stability; Feedback circuits; Geometrical optics; Microstructure; Negative feedback; Negative feedback loops; Optical amplifiers; Optical feedback; Semiconductor optical amplifiers; Stimulated emission;
Conference_Titel :
Telecommunications in Modern Satellite, Cable and Broadcasting Services, 1999. 4th International Conference on
Conference_Location :
Nis
Print_ISBN :
0-7803-5768-X
DOI :
10.1109/TELSKS.1999.804758
