Coherent light generators – Particular active media – Semiconductor
Patent
1985-08-26
1988-01-12
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 20, 372 26, 372 96, H01S 319
Patent
active
047196360
ABSTRACT:
A semiconductor laser device which oscillates with a single longitudinal mode and has a continuous wavelength tuning capability. The laser comprises an n-InP substrate which is divided into a tuning region, active region and phase control region, each defined by a separate electrically isolated electrode. The InP substrate has a diffraction grating in the tuning region and an active layer in the active region, the active layer having a wavelength composition which causes the emission of light with a single longitudinal mode when a drive current is injected into the active region from the corresponding electrode. Continuous wavelength tuning is provided by injecting concurrently into the semiconductor a tuning current and a phase current through the respective electrodes in a predetermined ratio.
REFERENCES:
patent: 4101845 (1978-07-01), Russer
patent: 4558449 (1985-12-01), Gordon
patent: 4608697 (1986-08-01), Coldren
"Bragg Wavelength-Tunable DBR-DC-PBH LD", (in Japanese), 1984 National Convention (Record) of the Institute of Electronics and Communication Engineers of Japan, Part 4, Paper No. 1022.
Davie James W.
NEC Corporation
Randolph Bertha
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