An optical-frequency pulse-position-modulation experiment
Abstract
This paper describes an optical-frequency pulse-position-modulation experiment using a GaAs luminescent diode as the source and either a p-i-n or an avalanche photodiode as the detector. The experimental system transmits an audio band from 300 Hz to 3.4 kHz at an 8-kb/sec repetition rate. Timing synchronization between the transmitter and receiver has been accomplished by two methods: by transmitting a separate clock signal and by recovering the timing from the PPM signal itself. Data show, with each scheme, peak-signal to rms-noise ratios of 70 dB can be achieved with the required average optical power at the receiver being - 73 dBm with a p-i-n detector and - 88 dBm with an avalanche detector.
- Publication:
-
AT T Technical Journal
- Pub Date:
- February 1975
- Bibcode:
- 1975ATTTJ..54..285H
- Keywords:
-
- Electro-Optics;
- Gallium Arsenides;
- Light Emitting Diodes;
- Optical Communication;
- Pulse Position Modulation;
- Signal To Noise Ratios;
- Avalanche Diodes;
- Channels (Data Transmission);
- Photodiodes;
- Root-Mean-Square Errors;
- Semiconductor Devices;
- Signal Transmission;
- Electronics and Electrical Engineering