Method of extending the capture range of a wavelength...

Details Method of extending the capture range of a wavelength... Method of extending the capture range of a wavelength...

2005-05-17

2005-05-17

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having partially reflecting plates in series

C356S520000, C356S470000, C356S454000

Reexamination Certificate

active

06894789

ABSTRACT:
The invention relates to a method of extending the capture range (CR) of a wavelength monitor for the lasers of a wavelength division multiplex (WDM) transmission system wherein the capture range (CR) comprises one wavelength period (FSR) of a periodic error signal (E) generated with the aid of the wavelength filter (4), the capture range contains a desired wavelength (λ0) of a plurality of equidistant wavelengths (λi, λi+1, λi+2, . . . ), each of the lasers of the WDM transmission system is set at a desired wavelength (λ0) by comparing the error signal (E) with an comparison value (C1or C2), that is unique in the capture range (CR) for a chosen slope sign, the wavelength period (FSR) of the error signal (E) is set such that it corresponds to double the wavelength spacing (A) of two adjacent wavelengths of the WDM transmission system and the desired wavelength (λ0) is set taking into account the slope sign of the error signal (E), and further relates to a wavelength monitor and laser system therefor.

REFERENCES:
patent: 4815081 (1989-03-01), Mahlein et al.
patent: 5331651 (1994-07-01), Becker et al.
patent: 5438579 (1995-08-01), Eda et al.
patent: 5798859 (1998-08-01), Colbourne et al.
patent: 6067181 (2000-05-01), Mizrahi
patent: 6233263 (2001-05-01), Chang-Hasnain et al.

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