Sawyer Law Group LLP
Tunable, low back-reflection wavelength division multiplexer
 The tunable wavelength division multiplexer is disclosed. The wavelength division multiplexer includes a fiber, a holder, a filter, and an isolator. The fiber carries an optical signal that includes a plurality of channels. The holder has and end and an axis. The holder receives the first fiber in an aperture such that the first fiber is separated from the axis by a distance. The distance is selected to tune the first angle of incidence so that the filter transmits a portion of the optical signal centered around at least one particular wavelength. The optical signal from the fiber impacts the filter at a first angle of incidence. The filter transmits a portion of the optical signal centered around at least one particular wavelength. The isolator is optically coupled with the filter and prevents a first portion of the portion of optical signal transmitted by the filter from returning to the first fiber. Thus, not only is the filter tunable, but because of the presence of the isolator, back reflections to the first fiber are also reduced. 
Oplink Communications, Inc.
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inventional inventional inventional
Feng Wei-Zhong Haiguang
Liu Li Lu