CWDM filter with four channels

Details CWDM filter with four channels CWDM filter with four channels

2008-01-01

2008-01-01

Chang, Audrey (Department: 2872)

Optical: systems and elements

Light interference

Electrically or mechanically variable

C359S588000, C359S589000, C359S260000

Reexamination Certificate

active

07315420

ABSTRACT:
A CWDM filter having four channels of the present invention comprises a substrate and odd number of stack structures. Each stack structure includes a first multi-layer stack, a spacer layer, a second multi-layer stack and a coupling layer arranged in turn from the side thereof approaching the substrate. The rules of the coupling layer of the No. [(N+1)/2−1] stack structure and the coupling layer of the No. [(N+1)/2+1] stack structure both are (2n+1)L, among which, n being a positive whole number, L representing for a low refraction index layer with a thickness of λ0/4 and λ0representing for the center wavelength thereof. While the coupling layers of the other stack structures can be expressed as L.

REFERENCES:
patent: 5999322 (1999-12-01), Cushing
patent: 6831784 (2004-12-01), Takeda
patent: 2006/0012882 (2006-01-01), Shang

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