Device and method for measuring wavelength of an optical signal

Details Device and method for measuring wavelength of an optical signal Device and method for measuring wavelength of an optical signal

2007-11-30

2009-11-10

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S226000, C250S227110, C250S552000, C257S053000, C356S411000

Reexamination Certificate

active

07615730

ABSTRACT:
A wavelength meter, an associated method, and system are generally described. In one example, an apparatus includes a photodiode to receive an optical signal and to generate a photocurrent upon receiving the optical signal, the photodiode having an absorption edge that is substantially aligned with a band of wavelengths, wherein the absorption edge shifts toward longer wavelengths when a reverse bias is applied to the photodiode, and control electronics coupled with the photodiode to apply at least a first reverse bias and a second reverse bias to the photodiode, wherein a ratio of a first measurement of the photocurrent at the first reverse bias and a second measurement of the photocurrent at the second reverse bias provides information about the wavelength of the optical signal.

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Office Action received for GB patent Application No. 0821387.8, mailed on Apr. 1, 2009, pp. 1-10.

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