Dispersion compensation device and dispersion compensation method
AssigneeHitachi Communication Technologies, Ltd.
InventorsYasuyuki Fukashiro, Hiroyuki Nakano, Tetsuya Uda, Tooru Hirai
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Abstract
A dispersion compensating fiber whose chromatic dispersion is positive and a negative dispersion compensating fiber whose chromatic dispersion is negative are prepared, and division-multiplexed optical signals, after being guided to either dispersion compensating fiber to once shift the whole wavelength band to positivity or negativity, are subjected to fine adjustment with a dispersion compensating fiber of a reverse sign.
Claims7
A dispersion compensation device, wherein:
- one end of a first fiber having a positive chromatic dispersion characteristic and one end of a second fiber having a negative chromatic dispersion characteristic are connected to each other,
- first optical signals are inputted from the end of said first fiber,
- second optical signals are outputted from the end of said second fiber, and
- chromatic dispersion of said first optical signals is thereby compensated for.
A dispersion compensation device, wherein:
- one end of a first fiber having a positive chromatic dispersion characteristic and one end of a second fiber having a negative chromatic dispersion characteristic are connected to each other,
- first optical signals are inputted from the end of said second fiber,
- second optical signals are outputted from athe end of said first fiber, and
- chromatic dispersion of said first optical signals is thereby compensated for.
A dispersion compensation device, wherein:
- optical signals inputted to a first port of an optical circulator are outputted from a second port of said optical circulator, made to pass a first fiber whose one end is connected to the second port and a second fiber whose one end is connected to an the end of said first fiber,
- turned back by a mirror connected to the other end of said second fiber, made to pass said second fiber and the first fiber again, and outputted from a third port of thesaid optical circulator, wherein:
- a first chromatic dispersion characteristic of first fiber and a second chromatic dispersion characteristic of second fiber differ in positive/negative sign.
A dispersion compensation device, comprising:
- dispersion compensation units each further having a dispersion compensating fiber, a 1 ×2 optical switch connected an input port to one end of the dispersion compensating fiber, and a mirror port connected to a first output terminal of the 1 ×2 optical switch;
- a mirror;
- and an optical circulator, wherein:
- said optical circulator outputs optical signals inputted to a first port to a second port and outputs optical signals inputted to the second port to a third port,
- said dispersion compensation units are connected in series to the second port with another end of the dispersion compensating fiber as input and the second output terminal of the 1 ×2 optical switch as output, and
- a plurality of dispersion quantities can be set by setting a plurality of the 1 ×2 optical switches and fitting said mirrors to one mirror port.
A dispersion compensation method, wherein:
- optical signals are subjected to positive dispersion compensation of which a first dispersion compensation quantity is positive, and
- said optical signals subjected to the positive dispersion compensation are subjected to dispersion compensation of which a second dispersion compensation quantity, smaller in absolute value than the first dispersion compensation quantity, is negative.
A dispersion compensation method, wherein:
- optical signals are subjected to negative dispersion compensation of which a first dispersion compensation quantity is negative, and
- said optical signals subjected to the negative dispersion compensation are subjected to dispersion compensation of which a second dispersion compensation quantity, smaller in absolute value than the first dispersion compensation quantity, is positive.
Dependencies are inferred from the claim text.