The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2003
Filed:
Dec. 15, 2000
Kit M. Cham, Cupertio, CA (US);
Myunghee Lee, San Jose, CA (US);
James J. Dudley, Sunnyvale, CA (US);
Stefano G. Therisod, San Jose, CA (US);
Craig T. Cummings, Cupertino, CA (US);
Yu-Chun Chang, San Jose, CA (US);
Ye Christine Chen, San Jose, CA (US);
Christopher L. Coleman, Santa Clara, CA (US);
Ronald Kaneshiro, Mountain View, CA (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
For each channel in a parallel channel optical array, a diffractive optical arrangement (DOA) includes an input region that is configured to pass a first portion of an input beam to an output region for data transmissions and to diffract and direct a second portion to a detection region for monitoring. The input region includes the diffractive features of a computer generated hologram (CGH) or a grating for diffracting. Alternatively, the input region is coupled to the CGH or grating. Moreover, the DOA includes at least one reflective region for redirecting the second portion. In one embodiment, the DOA includes a separate active surface for each channel of the array. Alternatively, the DOA has a singular active surface that is positioned to interact with all the channels. Optical power output from the second portion is monitored to generate feedback signals for adjusting the input current to each laser. Additionally, optical power output from sensed temperature is monitored to generate feedback signals.