By Pieter J.M. Kerstens, Subhash Chandra, Charles Breverman, And Kevin W. Haberern, North American Philips Laboratories
A repeaterless transmission system capable of transmitting ten video and two, 1.544 MBit/s, digital channels over one singlemode fiber up to distances of 45 km was developed. The system consists of ten wide-band Frequency Modulation modems, two digital modems, two long wavelength laser diodes that are both in the 1300 nm range and approximately 50 nm apart, and a specially developed Wavelength Division Multiplexer pair with a total insertion loss of 2.5 dB. The received video signal quality meets or exceeds the Rs- 250-B long haul standard and the uncorrected Bit Error Rate is less than 1.0x10E-9. The number of channels and wavelengths can be changed to meet specific link length and optical margin requirements. A description of the system as well as test results are presented.