Multi-port high isolation filters

Details Multi-port high isolation filters Multi-port high isolation filters

2005-10-06

2009-02-03

Choi, William C (Department: 2873)

Optical communications

Multiplex

Wavelength division or frequency division

C385S024000, C385S034000, C398S079000

Reexamination Certificate

active

07486891

ABSTRACT:
Techniques for designing optical devices with high isolation are disclosed. The high isolation is achieved by causing a reflected light signal to go through another filter. According to one embodiment, an optical apparatus comprises a first optical filter configured to transmit a first selected wavelength and reflect all other wavelengths, a second optical filter the second optical filter configured to transmit a second selected wavelength and reflect all other wavelengths. The first optical filter, being not perfect and producing a reflected signal with a residual of a signal at the first selected wavelength, the residual of the signal is minimized by the second optical filter when the reflected signal is impinged upon the second optical filter.

REFERENCES:
patent: 5818986 (1998-10-01), Asawa et al.
patent: 6856722 (2005-02-01), Sasaki et al.

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