Tuning a narrow band filter for telecommunication...

Details Tuning a narrow band filter for telecommunication... Tuning a narrow band filter for telecommunication...

2006-06-06

2006-06-06

Epps, Georgia (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave directional modulation

C359S287000

Reexamination Certificate

active

07057799

ABSTRACT:
An optical tunable filter that includes a thin-film filter for band-passing at least two bands of wavelengths. The tunable filter further includes a tunable band-passing device tunable over the at least two bands for tuning to a tunable pass-band spectrally overlapped with one of the at least two bands. The tunable band-passing device further includes an Acousto-optical cell tunable with acoustic wave signals. The thin-film filter cooperating with the tunable band-pass device for generating a tunable output waveform that has substantially a square waveform spectrally corresponding to the at least two bands. The thin-film filter further cooperates with the tunable band-pass device for generating a tunable output waveform having substantially a square waveform over a spectral range of a C-band, an L-band and an S-band. The tunable band-pass device band-passes a tunable substantially Sinc-function-like waveform and the thin film filter band-passing a substantially square waveform with a center attenuated dip for compensating the tunable substantially Sinc-function waveform.

REFERENCES:
patent: 4456338 (1984-06-01), Gelbart
patent: 5216484 (1993-06-01), Chao et al.
patent: 5463493 (1995-10-01), Shah
patent: 6587607 (2003-07-01), Aoki et al.

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