Coherent light generators – Particular resonant cavity
Reexamination Certificate
2006-12-05
2009-08-25
Nguyen, Dung T (Department: 2828)
Coherent light generators
Particular resonant cavity
C372S006000, C372S099000
Reexamination Certificate
active
07580441
ABSTRACT:
Provided is an athermal external cavity laser (ECL), whose output optical power and output wavelength can be kept regular irrespective of temperature changes without using additional temperature controlling components. The ECL comprises: a semiconductor amplifier; an optical fiber comprising a core in which a Bragg grating is formed and a cladding surrounding the core; and a thermosetting polymer that fixes the optical fiber to a ferrule and has a negative thermooptical coefficient, wherein the thickness of the cladding surrounding the core in which the Bragg grating is formed is smaller than the portion of the cladding surrounding the portion of the core where the Bragg grating is not formed, and the thermosetting polymer the negative thermooptical coefficient surrounds the cladding. The ECL does not need additional temperature controlling components and thus can be manufactured compact and at low cost, and thus can be used as a light source of a dense wavelength division multiplexing (DWDM) system in designing economical WDM passive optical networks (PON).
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Cho Seung Hyun
Jeong Geon
Kim Byoung Whi
Kim Chul Young
Lee Jie Hyun
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Nguyen Dung T
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