Optical waveguides – With optical coupler – Plural
Patent
1994-12-28
1997-01-21
Ngo, John
Optical waveguides
With optical coupler
Plural
C02B 628
Patent
active
055966616
ABSTRACT:
In accordance with the invention, a new type of monolithic optical waveguide filter comprises a chain of optical couplers of different effective lengths linked by differential delays of different lengths. The transfer of the chain of couplers and delays is the sum of contributions from all possible optical paths, each contribution forming a term in a Fourier series whose sum forms the optical output. A desired frequency response is obtained by optimizing the lengths of the couplers and the delay paths so that the Fourier series best approximates the desired response. The filter is advantageously optimized so that it is insensitive to uncontrolled fabrication errors and is short in length. The wavelength dependence of practical waveguide properties is advantageously incorporated in the optimization. Consequently, the filter is highly manufacturable by mass production. Such filters have been shown to meet the requirements for separating the 1.3 and 1.551 .mu.m telecommunications channels and for flattening the gain of Er amplifiers.
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Henry Charles H.
Laskowski Edward J.
Li Yuan P.
Mak Cecilia Y.
Yaffe Henry H.
Books Glen E.
Lucent Technologies - Inc.
Ngo John
Pacher Eugen E.
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