Optical transmitter for the common transmission of analog signal

Details Optical transmitter for the common transmission of analog signal Optical transmitter for the common transmission of analog signal

1994-06-10

1996-01-09

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1004

Patent

active

054833736

ABSTRACT:
An optical transmitter for the joint transmission of analog and digital signals is indicated, which, although it contains an optical transmitting component (5) with a laser, does not exhibit an increase in the bit error rate when transmitting the digital signals, due to so-called clipping. The clipping, a negative overmodulation of the laser to below the laser threshold, which occurs because of the constructive interference of the analog signal carders, is prevented by a limiter (8) located upstream of the modulation input of the optical transmitting component (5). The limiter contains a time-variant network that supplies a specified minimum voltage to the modulation input every time a comparator (7) determines that the modulation voltage has dropped below the predetermined threshold.

REFERENCES:
patent: 4864649 (1989-09-01), Tajima
"Analysis of BER of 16QAM Signal in AM/16QAM Hybnd Optical Tansmission System" Joy K. Maeda, et al. Electronic Letters, vol. 29, No. 7, pp. 640-642.
Electronic Letters, Bd. 24, Nr. 10, 12, May 1988, Stevenage GB, Seiten 611-613 W. I. Way et al. "Simultaneous transmission of 2 Gbit/s digital data and ten FM-TV analogue signals over 16.5 km SM fibre".
Patent Abstracts of Japan, vol. 15, No. 241 (E-1080) 21. Jun. 1991 & JP-A-03 074 942 (NEC).

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