High optical rejection optical spectrum analyzer/monochromator

Details High optical rejection optical spectrum analyzer/monochromator High optical rejection optical spectrum analyzer/monochromator

2005-08-16

2005-08-16

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

C356S327000, C356S333000, C356S334000

Reexamination Certificate

active

06930776

ABSTRACT:
A dual-channel, double-filtering, multi-pass OSA having a narrow spectral linewidth response and high ORR comprises a diffraction grating (DG), two input ports (P1′, P1″) for directing first and second input light beams (LR, LT) onto the grating; a retroreflector (RAM1) for returning the dispersed light beams to the grating for dispersion again; two intermediate output ports (P2′, P2″) for receiving the twice-dispersed light beams; two secondary input ports (P3′, P3″) coupled to the intermediate output ports by polarization-maintaining waveguides (PMF2′, PMF2″) for directing the light beams onto the grating a third time, with their SOPs having a predetermined orientation relative to the SOPs of the first and second light beams when first incident upon the grating, the retroreflector (RAM1) returning the three-times-dispersed light beams to the grating for dispersion a fourth time; and two output ports (P4′, P4″) for receiving the light beams after dispersion the fourth time.

REFERENCES:
patent: 5233405 (1993-08-01), Wildnauer et al.
patent: 5886785 (1999-03-01), Lefevre et al.
patent: 6177992 (2001-01-01), Braun et al.
patent: 6337940 (2002-01-01), Lefevre
patent: 2001/0030745 (2001-10-01), He et al.
patent: 2315452 (2001-02-01), None

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