Assembly of VCSEL light source and VCSEL optical detector

Details Assembly of VCSEL light source and VCSEL optical detector Assembly of VCSEL light source and VCSEL optical detector

1995-12-29

1997-07-15

Bovernick, Rodney B.

Coherent light generators

Particular active media

Semiconductor

372 96, 257 80, 257 84, 2502141, H01S 319, H01S 308, H01L 2715

Patent

active

056489790

ABSTRACT:
There is provided an assembly of a light source and an optical detector, each using a vertical cavity surface emitting laser (VCSEL). To control light emission of the VCSEL light source, spontaneous light emitted laterally therefrom is converted into an electrical signal. The optical detector for monitoring light is provided around the light source to supply the feedback electrical signal. The inner surface facing the light source of the optical detector is circular to absorb the spontaneous light and the outer surface thereof is polygonal having a plurality of peaks and valleys. Therefore, most of spontaneous light absorbed in the optical detector is reflected within, not penetrating the outer surface thereof, thereby extending the path of the spontaneous light in the optical detector and increasing the light intensity converted into an electrical signal.

REFERENCES:
patent: 4906839 (1990-03-01), Lee
patent: 5285466 (1994-02-01), Tabatabaie
patent: 5293393 (1994-03-01), Kosaka
patent: 5361273 (1994-11-01), Kosaka
patent: 5404373 (1995-04-01), Cheng
patent: 5475701 (1995-12-01), Hibbs-Brenner
patent: 5491712 (1996-02-01), Lin et al.
Hasnain et al., "Monolithic Integration of Photodetector with Vertical Cavity Surface Emitting Laser", Electronics Letters, vol. 27, No. 18, pp. 1630-1632 Aug. 1991.

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