Wavelength dispersion compensator and optical transmission line

Optical waveguides – With optical coupler – Input/output coupler

Reexamination Certificate

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C385S024000

Reexamination Certificate

active

06952509

ABSTRACT:
In the WDM optical transmission, optical signals propagated through an optical transmission line are supplied to a circulator of a wavelength dispersion compensator. The optical signals supplied to an input terminal of the circulator are transmitted to an input and output terminal of the circulator, and inputted to fiber gratings of the reflection type. The optical signals having a specified wavelength is reflected by one of the fiber gratings, again inputted to the input and output terminal of the circulator, and transmitted to the output terminal of the same. Since the incident optical signals are reflected by the fiber gratings situated at different positions, there arises the difference in the time spent in traveling to and from the fiber grating between the optical signals. Accordingly, the wavelength dispersions of the optical signals can be compensated by suitably selecting the positions of the fiber gratings.

REFERENCES:
patent: 5841926 (1998-11-01), Takeuchi et al.
patent: 6137604 (2000-10-01), Bergano
patent: 6421167 (2002-07-01), Cohen et al.

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