Effect of interfering echoes in a DPSK coherent optical transmission system with optical amplifiers
Abstract
Interfering echoes in semiconductor amplifier cascades can cause severe BER degradations in optical transmission systems. An experimental investigation of the effect in a coherenet system is described, and results in good agreement with theoretical predictions are reported. It is concluded that interfering echoes will severely limit the minimum interamplifier attenuation, which will in turn limit the number of semiconductor laser amplifiers that can be cascaded without optical isolation.
- Publication:
-
IEE Proceedings J: Optoelectronics
- Pub Date:
- August 1990
- Bibcode:
- 1990IPOpt.137..248W
- Keywords:
-
- Laser Cavities;
- Light Amplifiers;
- Optical Communication;
- Optical Fibers;
- Phase Shift Keying;
- Semiconductor Lasers;
- Cascades;
- Gallium Arsenide Lasers;
- Heterojunction Devices;
- Indium Phosphides;
- Optics