Fiber nonlinearity mitigation using strong mode coupling and large modal delay
AssigneeNEC Laboratories America, Inc.
InventorsFatih YAMAN, Shaoliang ZHANG, EDUARDO MATEO RODRIGUEZ, TAKANORI INOUE, KOHEI NAKAMURA, YOSHIHISA INADA, TAKAAKI OGATA
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Abstract
Aspects of the present disclosure describe fiber nonlinearity induced transmission penalties are reduced both in fibers with large polarization-mode dispersion, and in coupled-core multicore fibers (CC-MCF). In the case of coupled multi-core fibers, the requirement for modal delay is less.
Claims4
A method for reducing impairments arising from fiber nonlinearity comprising:
- providing a fiber exhibiting a large differential group delay (DGD);
- adjusting the DGD such that the DGD is sufficiently large that any average spreading from the DGD is comparable to spreading resulting from chromatic dispersion (CD).
A method for reducing impairments arising from fiber nonlinearity comprising:
- providing a fiber having multiple cores that are strongly coupled such that signals carried in the multiple cores mix frequently and continuously;
- wherein the length at which the signals carried in the multiple cores is less than the length at which any impairments from fiber nonlinearities become noticeable;
- wherein a group velocity in the individual, multiple cores are different.
A method for increasing transmission density of a system having coupled-core, multi-core fibers (CC-MCF) comprising:
- providing the CC-MCF fiber having a large mode group delay (MGD), wherein group velocity in individual cores of the multi-core fiber are different from one another;
- reducing core sizes of the individual cores while maintaining strong coupling between them such that signals carried in the multiple cores mix frequently and continuously while maintaining different group velocities in each core.
An optical fiber exhibiting reduced impairment from nonlinearity, said optical fiber characterized by:
- a large differential group delay (DGD) that is sufficiently large that any average spreading due to the DGD is substantially the same as any spreading resulting from chromatic dispersion (CD).
Dependencies are inferred from the claim text.