Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1992-04-08
1994-02-15
Lerner, Martin
Optical: systems and elements
Optical modulator
Light wave temporal modulation
356352, 359499, 359578, 385 11, G02B 2728, G01B 902
Patent
active
052872149
ABSTRACT:
Simple polarization independent wavelength tuning components (filters) employ a filter element, such as a Fabry-Perot etalon element, which is such that light input thereto undergoes two element transitions with orthogonal polarization states before being output, in order to suppress polarization noise. The element may be mounted for rotation about a single axis. In one arrangement, two etalon filters (20, 21), are separated by a half wave plate (22) providing the necessary polarization rotation. The two etalon filters and the half wave plate comprise a single element rotatable about the single axis.
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Day Stephen
Robertson Alexander J.
Lerner Martin
Northern Telecom Limited
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