Finisar Corporation

New Focus, Inc.

Peter Zupei Chen

Ping Peter Xie

Yonglin Huang

R Brad Bettman

Disclosed is a microbend fiber optic coupler and a method of forming same. The microbend fiber optic coupler includes two pairs of pigtail ends oriented one beside the other and having a bent fused biconically tapered coupling region interposed therebetween.

Microbend fused fiber coupler method and apparatus

Disclosed are fiber optic devices. The fiber optic devices disclosed include integrated fiber optic coupler-isolator combinations. These combinations are especially applicable to fiber optic tapping and pumping arrangements. By integrating such devices into a housed subassembly, enhanced size and design characteristics are achieved.

Integrated isolator fused coupler method and apparatus

A miniature dense wavelength division multiplexer (DWDM) is disclosed. A plurality of multi-window wavelength multiplexers (MWDM) are cascaded and optically coupled to form a tree, and each of the MWMDMs forming the tree comprises a microbend coupler. The forming of the MWDM tree is characterized by the absence of the bending of optical fibers external to the microbend couplers. A finished DWDM assembly measures less than 50 mm in width.

Miniature dense wavelength division multiplexer using microbend couplers

Various aspects of thermal compensated Bragg grating filters are disclosed. In one disclosed aspect, an optical fiber having a Bragg grating therein is laid adjacent to a torsion member, and the two are then rigidly affixed between a torsion adjusting member and a compensating member. The torsion adjusting member may then be rotated, twisting the optical fiber around the torsion member, and thus applying torsion to the optical fiber containing the Bragg grating, and changing the period of the Bragg grating. A further disclosed aspect provides an optical fiber, containing a Bragg grating filter therein, which is rigidly affixed between a torsion adjusting member and a compensating member in an axis other than the compensating member's longitudinal axis. The torsion adjusting member may then be rotated to apply torsion to the optical fiber, and change the period of the Bragg grating. Another disclosed aspect comprises an optical fiber, containing a Bragg grating filter therein, and a compensating member having a desired thermal coefficient of expansion. The optical fiber is bent through a curve and affixed to the compensating member such that torsion is applied to the Bragg grating region of the optical fiber.

Thermal compensated compact bragg grating filter

A method and apparatus for compensating an optical filter is disclosed. The device substantially maintains the selected center wavelength in the optical filter across a range of operating temperatures. In an embodiment of the invention an optical filter is disclosed for filtering a selected channel among a plurality of multiplexed channels of an optical communication. The optical filter includes an optical fiber and an elongate housing. The optical fiber has a first side and a second side and a filter portion intermediate the first side and the second side, and the optical fiber for transmitting the multiplexed optical communication and the filter portion for filtering the selected channel. The elongate housing includes exposed end portions through which the optical fiber extends. The optical fiber is affixed at each exposed end portion. The exposed end portions exhibit between them a negative coefficient of thermal expansion sufficient to generate strains on the filter to substantially stabilize a filtered wavelength to substantially correspond with the selected channel during temperature variations. In an alternate embodiment of the invention the elongate housing is defined about a longitudinal axis and including a first anchor pad and a second anchor pad to which the filter portion is affixed. At least one of the anchor pads is at least initially movable in a plane intersecting the longitudinal axis to vary a strain on the filter portion to tune a center wavelength of the selected channel. In another embodiment of the invention an optical filter for filtering an optical signal is disclosed. In still another embodiment of the invention a method for compensating an optical filter is disclosed.

Method and apparatus for compensating an optical filter

Disclosed is a fiber optic coupler which includes a fused, stretched, and twisted biconical tapered region; a first pair of fiber pigtail ends extending from a first end of said biconical tapered region; a second pair of fiber pigtail ends extending from a second end of said biconical tapered region; and polarization dependent loss preclusion means disposed within said biconical tapered region. Further disclosed is a method for forming the polarization insensitive coupler as described.

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Santa Clara, CA, United States of America

Peter Zupei Chen