Yiqiang Lee Li

7039271, May 2, 2006

Mar 12, 2003

10/387239

Eric V. Chamness - Moutain View CA, US
Jenkin A. Richard - Palo Alto CA, US
Yiqiang Li - San Jose CA, US

Oplink Communications, Inc. - Fremont CA

G02B 6/28

385 24

A low cost compact integrated 4-port single-channel OADM with improved optical isolation and low insertion loss is provided in which a 4-fiber pigtail includes I/O fibers and add/drop fibers, which are arranged on the same side of the multiplexer. A lens, filter and reflector are arranged in a double-pass configuration to route the optical signals to and from the appropriate fibers. The fibers are suitably arranged with the input and drop fibers at the corners of one diagonal and the output and add fibers at the corners of the crossing diagonal with the midpoints of the diagonals intersecting. Furthermore, a point halfway between the input and output fibers suitably lies at or near the central axis of the collimating lens.