Coherent light generators – Particular active media – Semiconductor
Patent
1989-12-06
1991-02-19
Gonzalez, Frank
Coherent light generators
Particular active media
Semiconductor
372 96, 372 20, H01S 319
Patent
active
049950487
ABSTRACT:
A tunable semiconductor diode laser with distributed reflection (DBR semiconductor laser) having a wide wavelength range is a suitable transmitter or local oscillator in a receiver in heterodyne and coherent optical glass fiber communication systems. Such a diode includes, in addition to the Bragg section in which the Bragg reflection takes place, an active section in which the radiation-emitting active region is present. When such a semiconductor diode laser is further provided with a so-called phase section, tuning is possible over a large wavelength range within one oscillation mode. A laser which is continuously tunable over the whole wavelength range is obtained by provided a mechanism by which the intensity of radiation which is reflected at the junction between the active section and the phase section is made low with respect to the intensity of the radiation which returns from the phase section to the active section.
REFERENCES:
patent: 4719636 (1988-01-01), Yamaguchi
patent: 4751710 (1988-06-01), Yamaguchi et al.
patent: 4813054 (1989-03-01), Plumb
patent: 4885753 (1989-12-01), Okai et al.
patent: 4920542 (1990-04-01), Brosson et al.
Kuindersma Pieter I.
Van Dongen Teunis
Biren Steven R.
Gonzalez Frank
Morse Susan S.
U.S. Philips Corp.
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