Modulator device for generating an optical transfer signal...

Details Modulator device for generating an optical transfer signal... Modulator device for generating an optical transfer signal...

2011-01-25

2011-01-25

Lester, Evelyn A. (Department: 2873)

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

C375S303000, C375S240000, C375S320000, C375S334000, C398S185000, C398S187000, C398S192000, C398S193000, C398S077000, C398S081000, C398S095000, C359S238000

Reexamination Certificate

active

07876852

ABSTRACT:
According to the invention, a very narrow-band transfer signal (LS) is generated by serially connecting a frequency modulator (2) and an amplitude modulator (4). The frequency modulator (2) is operated at a modulation index which at least largely suppresses the carrier signal (TS) while the amplitude modulator (4) suppresses the broadband portion of the spectrum by fading out the transfer signal (LS) during frequency-shift keying.

REFERENCES:
patent: 6592274 (2003-07-01), Kahn et al.
patent: 7577367 (2009-08-01), Way
patent: 2003/0002121 (2003-01-01), Miyamoto et al.
patent: 2003/0043931 (2003-03-01), Fullerton et al.
patent: 0825733 (1998-02-01), None
patent: 2237469 (1991-05-01), None
patent: WO-2005/084268 (2005-09-01), None
IEEE Photonics Technology Letters, 2006 vol. 18, issue 02 pp. 385-387: “Chirp-managed directly modulated Laser (CML)”, by Y. Matsui et al. AZNA Corporation, USA).
European Conference on Optical Communication 2005 (ECOC 2005), paper Th2.2.5: “Initial Phase Control Method for High-Speed External Modulation in Optical Minimum-Shift Keying Format”, by T. Sakamoto et al.
IEEE Photonics Technology Letters, 1998 vol. 10, issue 8, pp. 1159-1161: “Prechirped Duobinary Modulation” by Anders Djupsjöbacka.

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