Pulse Width Modulation for analog fiber optic communications.
01 January 1987
Characteristics of Pulse Width Modulation (PWM) were studied to provide an analog communication alternative in fiber optic links to the predominantly digital techniques presently used. Large analog signal dynamic range and high SNR coupled with intermodulation free PWM makes it very attractive for broadband Local Area Network (LAN) application, including future information oriented offices, hospitals and automated factory floors. A simple video link was constructed using common laboratory equipment. The performance of the video link supports the PWM modulation theory developed here and elsewhere. Analog transmission capability was experimentally demonstrated. SNR was only limited by the carrier noise and no evidence of the intermodulation problem was observed.