High isolation wavelength division devices

Details High isolation wavelength division devices High isolation wavelength division devices

2011-03-22

2011-03-22

Dinh, Jack (Department: 2873)

Optical communications

Multiplex

Wavelength division or frequency division

C359S634000

Reexamination Certificate

active

07912374

ABSTRACT:
Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, an optical filter and a reflecting element are used. Depending on implementation, the reflecting element may be another optical filter, a prism and a mirror. The reflecting element is provided to direct a reflected light beam from the optical filter back to the optical filter for additional filtering, wherein the reflected light is a filtered signal that is presumably carrying residuals of unwanted signals (e.g., a transmitted signal of the optical filter). With a proper placement of the reflecting element with respect to the optical filter, the reflected light beam can be redirected back to the optical filter for a predefined number of times so that the errors or residuals in the reflected light beam are much reduced, if not completely removed.

REFERENCES:
patent: 7215853 (2007-05-01), Morita et al.
patent: 2003/0228101 (2003-12-01), Tai

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