Oscillators – Molecular or particle resonant type
Patent
1978-01-13
1979-06-26
Davie, James W.
Oscillators
Molecular or particle resonant type
350 9611, 350 9612, H01S 319
Patent
active
041594525
ABSTRACT:
A dual beam laser incorporates a tapered layer within the optical cavity of a GaAs-AlGaAs double heterostructure laser. Dual output waveguides are therefore provided at one of the mirrors. By suitable variations of layer thickness and/or composition, the device operates either as a tapered power divider (TPD), branching the incident power of a single mode into the two output arms of the device, or as a tapered mode splitter (TMS), diverting different transverse modes into different arms. Because the different modes of the TMS have different thresholds, the laser can be pulsed with current pulses of different amplitude to control at which of the waveguides an output appears. The TPD, on the other hand, has coupled cavities which tend to suppress all but one dominant longitudinal mode. Also described is an integrated optical circuit embodiment of the TPD in which the resonator is formed by etched mirrors.
REFERENCES:
patent: 3948583 (1976-04-01), Tien
patent: 3978426 (1976-08-01), Logan et al.
H. Yajima, "Dielectric Thin-Film Optical Branching Waveguide", Appl. Phys. Let., vol. 22, No. 12, pp. 647-649, Jun. 15, 1973.
W. K. Burns et al., "Mode Conversion in Planar-Dielectric Separating Waveguides", IEEE Journal of Quantum Electronics, vol. QE-11, No. 1, pp. 32-39, Jan. 1975.
Logan Ralph A.
Merz James L.
Bell Telephone Laboratories Incorporated
Davie James W.
Rohm Benita J.
Urbano Michael J.
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