Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-10-30
2007-10-30
Harvey, Minsun Oh (Department: 2828)
Optical communications
Multiplex
Wavelength division or frequency division
C398S065000, C398S092000, C372S075000
Reexamination Certificate
active
11098229
ABSTRACT:
A laser apparatus is disclosed combining polarized light beams from two optical emitters into a combined beam of light with controllable degree of polarization (DoP). The laser apparatus includes a polarization combiner for combining the polarized beams into the combined beam, an optical tap for separating out a portion of the combined beam, and a photodetector electrically coupled to a laser controller for providing a feedback signal. The controller distinctively modulates the polarized radiation of each of the emitters, detects modulation signals in the photodetector output and adjusts an output power ratio of the optical emitters for maintaining the DoP of the combined beam at a pre-determined level. The invention can be used for minimizing the DoP of pump radiation in Raman and EDFA pump laser modules combining multiple pump laser diodes.
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Bolshtyansky Maxim
King Nicholas
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Hagan Sean
Harvey Minsun Oh
JDS Uniphase Corporation
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