Wavelength branching filter and optical communication module

Details Wavelength branching filter and optical communication module Wavelength branching filter and optical communication module

2006-05-31

2009-08-25

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

C359S589000

Reexamination Certificate

active

07580191

ABSTRACT:
There is provided a low-cost wavelength branching filter that transmits lights of 1310 nm wavelength band, and reflects light of 1490 nm and 1650 nm wavelength bands. In one embodiment, a wavelength branching filter includes a first multilayer film filter positioned in a light incoming side on a glass substrate and a second multilayer film filter positioned in a light outgoing side, and the first multilayer film filter has characteristic in reflecting light of 1490 nm wavelength band and transmitting light of 1310 nm wavelength band, and the second multilayer film filter has characteristic in reflecting light of 1650 nm wavelength band and transmitting light of 1650 nm wavelength band and reflecting light of 1310 nm wavelength band.

REFERENCES:
patent: 6792181 (2004-09-01), Sasaki
patent: 2004/0184385 (2004-09-01), Katsuma et al.
patent: 2004/0184811 (2004-09-01), Takamori
patent: 99122321 (2000-05-01), None
patent: 10-10354 (1998-01-01), None
Chinese Office Action dated Feb. 20, 2009 in Chinese Application No. 2006-10107511.9.

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