Optical-filter array, optical transmitter and optical transmissi

Details Optical-filter array, optical transmitter and optical transmissi Optical-filter array, optical transmitter and optical transmissi

1995-09-27

1997-12-09

Lee, John D.

Optical waveguides

With optical coupler

Plural

359187, 372 20, 372 32, G02B 6293

Patent

active

056968590

ABSTRACT:
An optical transmitter provided by the present invention comprises: a light source; a band-pass filter for filtering a light generated by the light source; a light splitting means for splitting a light output by the band-pass filter into at least two split lights; an optical receiving unit for converting one of the split lights into an electrical signal having a level proportional to the intensity of the split light; and a control means for receiving the electrical signal for use in controlling the wavelength of the light source so as to sustain the intensity of the split light at a fixed value. With the configuration described above, fluctuations in wavelength occurring on the transmitter side can be reduced. On the top of that, by applying this optical transmitter to a WDM system, a system cold start can be done with ease.

REFERENCES:
patent: 4700352 (1987-10-01), Shikada et al.
patent: 5077619 (1991-12-01), Toms
patent: 5161044 (1992-11-01), Nazarathy et al.
patent: 5184244 (1993-02-01), Nishimura et al.
patent: 5311005 (1994-05-01), Visocchi
patent: 5347529 (1994-09-01), Noe
patent: 5570221 (1996-10-01), Fujita
T. Oguchi and I. Nishi, "Long-term spectral stability of TiO.sub.2 /SiO.sub.2 thin film filters deposited by lon-assisted deposition" CLEO 1987 TUK3 (Apr. 1987).
F. Forghieri et al., "Reduction of four-wave-mixing cross talk in WDM systems using unequally spaced channels", OFC/IOOC '93 Technical Digest FC4 (1993).
M. Kihara et al., "Loss Characteristics of Thermally Diffused Expanded Core Fiber", IEEE Photonics Technology Letters vol. 4 No. 12 pp. 1390-1391, Dec. 1992.

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