Long distance optical communication
Abstract
The advantages of optical fiber communications systems for long distance applications are examined along with relevant technical factors which make up a large portion of the system tradeoffs. The loss and dispersion of single mode, multimode stepped, and multimode graded index fibers are discussed and compared. Light source requirements and present candidates are given and compared. The signal power requirements at the input to the repeater for PCM are discussed for several receiver configurations. Repeater spacing versus bit rate tradeoffs are presented for two optical fiber systems. It is likely that either graded index or single mode fiber will be employed, although spatial multiplexing with step index fiber can be advantageous in some cases. As soon as cabling, splicing, and connector capabilities are established, optical fiber communications will be realizable for many long distance applications. The injection laser appears more suitable than the LED since more power can be coupled into multimode fiber and certainly to single mode fiber.
- Publication:
-
11th International Conference on Communications, Volume 2
- Pub Date:
- 1975
- Bibcode:
- 1975comm....2...32G
- Keywords:
-
- Fiber Optics;
- Laser Applications;
- Optical Communication;
- Telecommunication;
- Transmission Lines;
- Light Emitting Diodes;
- Multiplexing;
- Optical Fibers;
- Pulse Code Modulation;
- Repeaters;
- Transmission Loss;
- Communications and Radar