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Digital transmission of TV signals with a fiber-optic heterodyne transmission system

: Bachus, E.-J.; Bohnke, F.; Elze, G.; Eutin, W.; Foisel, H.; Heimes, K.; Strebel, B.

Optical Society of America -OSA-, Washington/D.C.; Institute of Electrical and Electronics Engineers -IEEE-:
Optical Fiber Communication Conference. Digest of technical papers : January 23 - 25, 1984
Washington, DC: OSA, 1984
Conference on Optical Fiber Communication <7, 1984, New Orleans/La.>
Conference Paper
Fraunhofer HHI ()
cable television; digital communication systems; optical fibres; optical links; digital transmission; bit error rate; optical communication; tv signals; fiber-optic heterodyne transmission system; laser transmitter; hitachi hlp 1400; 830 nm; single-polarization fiber coupler; apd mixer; carrier tracking branch; demodulation circuit; if spectrum; subcarrier frequency

The laser transmitter (Hitachi HLP 1400) radiates at a wavelength of 830 nm into the transmission fiber, which is a single-polarization type and 280-m long. It is spliced to a single-polarization fiber coupler at the receiver input. In the coupler the received light is added to the local laser light and fed to the APD mixer to generate the intermediate frequency of 1.5 GHz. After filtering in a bandpass with a 900-MHz bandwidth the IF power is divided into the carrier tracking branch and demodulation circuit. The IF spectrum shows lines at both sides of the main carrier according to the subcarrier frequency and the modulation-induced line broadening. To avoid phase jitter, the bit rate is a subharmonic of the subcarrier frequency. Bit-error rate was measured at better than 10-9. Because of the low bit-error rate, the transmitted TV signal produced an excellent picture quality.