US 7,076,169 B2 · System and method for orthogonal frequency division multiplexed optical communication

Abstract

A system for optical communication send optical signals over a plurality of wavelength channels. Each wavelength channel comprises a number of orthogonal subchannel frequencies which are spaced apart from one another by a predetermined amount. Each of the subchannel frequencies is modulated with data from a data stream. The data modulation scheme splits a subchannel frequency code into H and V components, and further processes the components prior to modulation with data. The various data-modulated subchannels are then combined into a single channel for transmission. The received signals are detected and demodulated with the help of a symbol timing recovery module which establishes the beginning and end of each symbol. A polarization mode distortion compensation module at the receiver is used to mitigate the effects to polarization more distortion in the fiber.

Claims32

Dependent claims

An optical communication receiver comprising:

an optical splitter having a splitter input and a plurality of splitter outputs, the optical splitter configured to receive an optical channel signal comprising a number K subchannel signals, and output K identical received channel signals;
K subchannel receivers, the subchannel receiver comprising optical and digital circuitry configured to receive the kth of said K identical received channel signals and a reference light beam having a subchannel frequency fk, and output a first digital signal representative of in-phase and quadrature components of a first orthogonal polarization component associated with the subchannel frequency fk, and also output a second digital signal representative of in-phase and quadrature components of a second orthogonal polarization component associated with the subchannel frequency fk, the first and second digital signals containing information representative of a data stream used to modulate the kth subchannel frequency;
and
a receiver processor configured to receive said first and second digital signals and output said data stream.

1 more element

Dependencies are inferred from the claim text.

System and method for orthogonal frequency division multiplexed optical communication

Life of this patent

System and method for orthogonal frequency division multiplexed optical communication

Life of this patent

Abstract

Claims32