Polarization-dependent and polarization-diversified opto-electro

Details Polarization-dependent and polarization-diversified opto-electro Polarization-dependent and polarization-diversified opto-electro

1991-02-01

1992-05-26

Lee, John D.

Optical waveguides

Polarization without modulation

357 30, 359488, 372 45, 385131, G02B 610

Patent

active

051174693

ABSTRACT:
A polarized semiconductive optical detector, laser, or amplifier in which the active layer includes a strained quantum well such that the strain splits the valence band so as to provide anisotropic absorption (and gain under population inversion) for two linear polarizations of light. The bands are split about the energy of the light so that the polarized device absorbs and thus detects, amplifies, or lases only one of the polarizations. To form a polarization-diversity detector, the polarized detector is set serially first on an optical waveguide, and a non-polarized or oppositely polarized detector is set serially second on the waveguide so as to detect the non-absorbed light of the other polarization. Such a polarization-diversity detector can be used to form a simple optical-disk pickup head or an array of pickup heads. A pair of such polarization diversity detectors can advantageously be comined with a 3 dB splitter and a local-oscillator laser to form a simple coherent receiver. by the same techniqes, dual-polarization lasers, polarization-multiplexed transceivers, and polarization-insensitive amplifiers are made possible.

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