Coherent light generators – Particular resonant cavity – Specified cavity component
Reexamination Certificate
2005-09-06
2005-09-06
Harvey, Min (Department: 2828)
Coherent light generators
Particular resonant cavity
Specified cavity component
C372S020000, C372S032000, C372S043010, C372S006000
Reexamination Certificate
active
06940889
ABSTRACT:
In accordance with the invention, a modulated RZ pulse source comprises a modulated light source optically coupled to a stabilized Bragg grating filter and one or more optical taps. The light source is preferably modulated in power and frequency and has an adjustable channel wavelength λ. The Bragg grating filter has a reflectivity bandwidth having a high slope reflectivity cutoff and is preferably tunable. A feedback arrangement responsive to the taps keeps the source channel wavelength λ on the edge of the reflectivity bandwidth for shaping RZ pulses. When the Bragg grating is stabilized, the feedback system maintains λ at a value linked to the grating reflectivity edge and, by overlapping at least part of the optical spectrum of the source, converts the modulated source light into RZ pulses with high extinction ratio (≧12 dB). The result is a high power, jitter-free RZ pulse source that is compact, inexpensive and power efficient.
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Haggan, C.W., etal., “Narrow-band Rejection Filters with Negligible Backreflection Using Titled Photoinduced Gratings in Single-Mode Fibers”, IEEE Photonics Technology Letters, IEEE Inc. New York, US, vol. 10, No. 5., May 1998, pp. 690-692.
Eggleton Benjamin John
Mahgerefteh Daniel
Steinvurzel Paul
Westbrook Paul Stephen
Harvey Min
Nguyen Dung (Michael) T
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