Dr. Sho Kamikawa Profile

Dr. Sho Kamikawa

at Koshin Kogaku Co Ltd

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Proceedings Article | 11 November 2008 Paper

How to design an easily deposited multi-band-pass filter

Sho Kamikawa

Proceedings Volume 7134, 713432 (2008) https://doi.org/10.1117/12.803710

KEYWORDS: Mirrors, Transmittance, Optical filters, Bandpass filters, Refractive index, Dielectrics, Fiber optic communications, Electronic filtering, Phase shifts, Interferometers

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A systemic design on multi-bandpass filters is developed based on a plurality of Fabry-Perot(FP) interferometers, which are composed of a cavity between mirrors. Certain number of passbands can be built by selecting the number of cavities, while the band-width and the band- interval can be adjusted by the total layers contained in mirrors. By changing the configuration of mirrors and cavities a huge group of multi-band-pass filter will be developed. Among many multi-bandpass filters given here several of them are tested. A double-passband filter is deposited on a super-thin substrate of thickness about 5 μm. One of its passbands situates 1550nm, three rejection bands situate 1310nm, 1490nm and 1640nm make this filter very useful for B-PON and GE-PON in the fiber communications. A triple-bandpass filter with four rejected bands is deposited on glass, its high transmittance in passbands and high isolation in rejection band make it a valuable filter for Add/Drop device. In another deposition its three passbands can transmit blue, green and red (B, G and R) lights but reject other lights which otherwise become noise to the B, G and R light signals. The good performances of the filters deposited above prove that multi-bandpass filter designed by this way is easy to do.

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