Servo-controlled light coupling between a light-emitting compone

Details Servo-controlled light coupling between a light-emitting compone Servo-controlled light coupling between a light-emitting compone

1989-09-08

1990-12-18

Ullah, Akm

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 9620, 25022714, G02B 632, G02B 626, G02B 636, H01J 516

Patent

active

049781901

ABSTRACT:
An optical module is used for communication over optical waveguides. To couples laser light to or from the optical waveguide (3) with as little loss as possible, the laser diode (2) must be precisely aligned with respect to the core region (22) of the end face (14) of the optical waveguide. In conventional modules, this requires costly and complicated mechanical couplers, which nevertheless do not have the necessary long-term stability. To solve the problem of how to provide a low-cost laser-to-fiber coupling which exhibits long-term stability, the optical module (1) is provided with a control facility (16, 17, 18) which controls the coupling of light on the basis of measurements of the differences in reflection factor between the core region (22) and the cladding region (23) of the end face of the optical waveguide (3). For this measurement and control, use can be made of low-priced components employed in CD players.

REFERENCES:
patent: 4296998 (1981-10-01), Dufft
patent: 4545643 (1985-10-01), Young et al.
patent: 4722586 (1988-03-01), Dodson et al.
"Optical Technology for Compact Disk Pickups", by Lee Lasers & Optronics, Sep. 1986, pp. 85-87.
"Neue Audiotechnik aus dem Schwartzwald", Funkschau, No. 4/1986, pp. 30-33.

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