A LOW-COST MULTICHANNEL OPTICAL-TRANSMISSION SYSTEM FOR VIDEO SIGNALS

A novel low-cost multichannel optical transmission system for video si gnals is described, The system uses time-division multiplex pulse-posi tion modulation (TDPPM), The transmitter and receiver are realized in a standard bipolar process while an external low cost laser and PIN ph otodiode are used. A maximum of 16 channels can be multiplexed, while achieving a weighted signal-to-noise ratio (SNR) of 54 dB, a different ial gain of 1% and a differential phase of 0.5 degrees. For a launched power of 0 dBm (pulse amplitude), the optical budget for a 45 dB weig hted SNR exceeds 20 dB, Besides video signals the system is also capab le of handling other signals such as digital coded audio signals or co mputer data, The feasibility of a four-channel system has been confirm ed by measurements.