Optical bandpass filter having a variable passband wavelength

Details Optical bandpass filter having a variable passband wavelength Optical bandpass filter having a variable passband wavelength

1992-03-19

1993-01-26

Healy, Brian

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

385 14, 385130, 372 7, 372 43, 372 50, 359885, 359890, 257 14, G02B 610, H01S 330, H01L 2712

Patent

active

051827883

ABSTRACT:
An optical bandpass filter comprises a waveguide region for guiding an optical beam from an input end to an output end, a clad structure provided above and below the waveguide region for confining the optical beam therein, a plurality of quantum well boxes formed in the waveguide region with respectively different quantum levels for selectively absorbing an optical component in the incident optical beam that causes a resonant absorption with the quantum level of the quantum well box, a barrier region provided in the waveguide region for surrounding each of the plurality of quantum well boxes with respect to all of three-dimensional directions and comprising a material having a second band gap that is substantially larger than said first band gap, and window means provided on the clad structure for directing a control optical beam such that the control optical beam irradiates the plurality of quantum well boxes.

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patent: 5032877 (1991-07-01), Bate
patent: 5126804 (1992-06-01), Nagai et al.
patent: 5128728 (1992-07-01), Liu

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