Patent Number: 7,042,922

Title: Method for calibrating photonic crossconnect device

Abstract: A method for calibrating a preferred disposition for a moveable first mirror of an optical switch core of a photonic crossconnect device relative to a second mirror thereof, the method comprising the steps of determining approximate geometric coordinates of the first mirror relative to the second mirror, effecting a laser light crossconnection between the first and second mirrors to produce data from which to provide first order corrections to refine the geometric coordinates, and effecting a further laser light crossconnection between the first mirror and a third mirror, to produce data from which to provide second order corrections to further refine the geometric coordinates, whereby to calibrate the first mirror such that upon initiation of a laser light crossconnection involving the first mirror, a switching element detects deviation of the first mirror from the preferred disposition thereof and effects corrective changes.

Inventors: Narayanan; Babu (San Jose, CA), Chen; Yong-Qin (San Jose, CA), Ward; Robert (St. Charles, IL), Indaheng; Rani (San Jose, CA), Raza; Humair (Sunnyvale, CA)

Assignee: Nortel Networks, Ltd.

International Classification: H01S 3/08 (20060101)

Expiration Date: 5/09/02018