Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2005-03-15
2005-03-15
Boutsikaris, Leo (Department: 2872)
Optical waveguides
With optical coupler
Plural
C398S081000, C398S147000
Reexamination Certificate
active
06868203
ABSTRACT:
This invention relates to an optical transmission system which allows high quality transmission of signal light where a plurality of signal channels are multiplexed, and has a configuration that is particularly suitable for CWDM optical transmission. In the optical transmission system, the plurality of signal channels propagating through the optical fiber transmission line are demultiplexed into a signal channel group in the first wavelength band Λ1and a signal channel group in the second wavelength band Λ2. Then, each signal channel in the second wavelength band Λ2where the absolute value of chromatic dispersion is large is dispersion-compensated. When the bit rate is B (Gb/s) at a specific wavelength in the second wavelength band Λ2where the total chromatic dispersion in the optical fiber transmission line and the dispersion compensator is highest, the chromatic dispersion value at this specific wavelength is set to be grater than 0 (ps
m) but 7500/B2(ps
m) or less, and is set such that the loss in the second wavelength band Λ2is lower than the highest loss in the first wavelength band Λ1.
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M. Kakui, et al. “2.4 Gbit/s repeaterless transmission over 306 km non-dispersion-shifted fiber using directly modulated DFB-LD and dispersion-compensating fiber”, Electronics Letters, vol. 31, No. 1, pp. 51-52, (1995).
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Boutsikaris Leo
McDermott Will & Emery LLP
Sumitomo Electric Industries Ltd.
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