Optical transmitter utilizing a bistable distributed feedback se

Details Optical transmitter utilizing a bistable distributed feedback se Optical transmitter utilizing a bistable distributed feedback se

1985-07-30

1990-08-07

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

372 96, 455611, 455613, 455618, H04B 900

Patent

active

049474588

ABSTRACT:
A bistable distributed feedback laser device is employed for transmitting optical signals. A bias current which is less than the threshold lasing turnoff current is supplied to the laser. A drive circuit provides a pulse current which, when added to the bias current, exceeds the threshold lasing turnon current. In this manner, the device is modulated so as to traverse the hysteresis region, hereby preventing undesirable expansion of the spectrum line width.

REFERENCES:
patent: 3680001 (1972-07-01), Paoli et al.
patent: 4558465 (1985-12-01), Siegel et al.
patent: 4603420 (1986-07-01), Nishizawa
patent: 4608682 (1986-08-01), Nagashima
patent: 4611352 (1986-09-01), Fujito et al.
patent: 4612671 (1986-09-01), Giles
patent: 4658402 (1987-04-01), Kabayashi
patent: 4665527 (1987-05-01), Akiba et al.
patent: 4674100 (1987-06-01), Kobayashi
Shigeyuki Akiba et al., "Distributed Feedback InGaAsP/InP Lasers With Window Region Emitting at 1.5/um Range", Ieee Journal of Quantum Electronics, vol. OE-19, No. 6, Jun. 1983, pp. 1052-1056.
Yamaguchi et al., "Paper 1026", 1984 National Convention (Record) of the Institute of Electronics and Communication Engineers of Japan, pp. 4-80.

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