Optical system for transmitting a multilevel signal

Details Optical system for transmitting a multilevel signal Optical system for transmitting a multilevel signal

1994-11-28

1996-04-23

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359173, 359181, 359189, 375287, 375289, H04J 1400, H04B 1004, H04B 1006

Patent

active

055109195

ABSTRACT:
In optical transmission systems it is desirable to increase the bit rate of digital signals to, e.g., 40 Gb/s and more. In such systems there is an upper bit-rate limit above which conventional directly modulated lasers and their drive electronics cannot be employed. An optical transmission system is disclosed in whose optical transmitter (1) an electric multilevel signal (V) composed of two electric digital signals (V.sub.1, V.sub.2) modulates a semiconductor laser (4), so that an optical multilevel signal (V) is transmitted. The optical receiver (2) contains a decision circuit (7) which recovers the digital signals (V.sub.1, V.sub.2).

REFERENCES:
patent: 3571725 (1971-03-01), Kaneko
patent: 4410878 (1983-10-01), Stach
patent: 4524462 (1985-06-01), Cottatelucci
patent: 4763326 (1988-08-01), Krick
patent: 5008957 (1991-04-01), Kiyano
patent: 5371625 (1994-12-01), Wedding et al.
"10 Gbit/s to 260000 Subscribers Using Optical Amplifier Distribution Network", B. Wedding et al, ICC/Supercomm 92, Optical Communications 300 Level Session, Impact of Optical Amplifiers on Network Architectures, pp. 1-8.
U. Tietze et al, Halbleiter-Schaltungstechnik, 8th ed., Springer-Verlag 1986, Chapter 8.5.1, p. 178.

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