Dispersion compensating fiber and optical transmission system in

Optical waveguides – Optical fiber waveguide with cladding

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385126, 385127, G02B 616

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058388672

ABSTRACT:
The present invention relates to a dispersion compensating fiber for improving a transmission system with it in total chromatic dispersion and dispersion slope in the 1.55 .mu.m wavelength band. The dispersion compensating fiber according to the present invention is characterized by having the following characteristics for light in the 1.55 .mu.m wavelength band: chromatic dispersion not less than -40 ps/km
m and not more than 0 ps/km
m; dispersion slope not less than -0.5 ps/km
m.sup.2 and not more than -0.1 ps/km
m.sup.2 ; transmission loss not more than 0.5 dB/km; polarization mode dispersion not more than 0.7 ps.multidot.km.sup.-1/2 ; mode field diameter not less than 4.5 .mu.m and not more than 6.5 .mu.m; cut-off wavelength not less than 0.7 .mu.m and not more than 1.7 .mu.m in the length of 2 m; and bending loss at the diameter of 20 mm, not more than 100 dB/m. The dispersion compensating fiber is optically connected with a dispersion shifted fiber as a compensated object at a ratio of appropriate lengths, which can improve the system including the dispersion compensating fiber in the total chromatic dispersion and dispersion slope of the system in the 1.55 .mu.m band.

REFERENCES:
patent: 4755022 (1988-07-01), Ohashi et al.
patent: 5361319 (1994-11-01), Antos et al.
Kubo et al, "Dispersion Flattened Single-Mode Fiber for 10,000km Transmission System",16th European Conference on Optical Communication, Sep. 1990, vol. 1.
Bachmann et al, "Dispersion-Flattened Single-Mode Fibers Prepared With PCVD: Performance, Limitations, Design Optimization", Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986, pp. 858-863.
Kubo et al. "Characteristics of Low Dispersion SM Fiber With Double Cladding" pp. 4-429.

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