CWDM filter

Optical: systems and elements – Light interference – Produced by coating or lamina

Reexamination Certificate

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C359S588000, C359S589000

Reexamination Certificate

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07580188

ABSTRACT:
A CWDM filter includes a substrate and a multi-layer structure coated on one side of the substrate. The multi-layer structure has the construction of H(LH)24L(HL)3H(LH)34L(HL)3H(LH)44L(HL)4H(LH)34 L(HL)3H(LH)44L(HL)4H(LH)34L(HL)3H(LH)34L(HL)2HLH4LH/NS, wherein NSis the substrate, L is a low (refraction) index layer with a thickness of λ0/4, H is a high (refraction) index layer with a thickness of λ0/4, and λ0is the center wavelength of the light transmitting through the CWDM filter.

REFERENCES:
patent: 6404521 (2002-06-01), Yang et al.
patent: 6831784 (2004-12-01), Takeda
patent: 2005/0099691 (2005-05-01), Hendrix et al.

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