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Remove Fiber Optic Signal Distortions with Virtual Filters

Technology Benefits

Removes signal distortions Simplifies electronic filtering Four-fold reduction in filter length

Technology Application

Optical signal transmission Stock trading fiber telecom

Detailed Technology Description

To compensate for the distortion, this novel technology first generates a model of the fiber by calculating the propagation of a wave through the fiber and creates a virtual fiber. This model is then used to real-time correct the transmitted signal by propagating the distorted signal backwards through the system in an electronic virtual environment. By reversing the sources of error, this electronic approach is more versatile and adaptable than physical means, as those are limited to material and physical characteristics. This technology is extendable to multi-wavelength schemes and can even be retrofitted to existing transmission systems.

Supplementary Information

Inventor: Li, Guifang | Goldfarb, Gilad
Priority Number: US8326159B2
IPC Current: H04B001006
US Class: 398208 | 398211
Assignee Applicant: University of Central Florida Research Foundation Inc.lando
Title: Electronic compensation of impairments using wavelet filters for backward propagation
Usefulness: Electronic compensation of impairments using wavelet filters for backward propagation
Summary: Method for compensating a transmission impairment over an optical transmission channel in optical transmission system of a wavelength division multiplexing (WDM) communication system.
Novelty: Compensating method for transmission impairment over optical transmission channel, involves solving nonlinear schrodinger equation using split-step Fourier method using linear operator with wavelet-based finite impulse response filter

Industry

Optics

Sub Category

Optical Fiber

*Abstract

Transmitting a signal over long haul optical fiber links leads to undesirable distortions, which in order for the signal to be effectively received, these distortions must be compensated for and the original signal recovered. Signal distortion results from linear processes, such as absorption and fiber chromatic dispersion, and non-linear processes, such as cross-phase modulation, four-wave mixing, and amplifier noise. Previously, physical means such as specialty fibers were used to correct these signals after transmission. Now, digital methods make use of inverse Fourier-Transform calculations to compensate for both linear and non-linear distortion.Compared to previous electronic correction techniques using inverse Fourier-Transform methods, wavelet-based filtering offers a significant computational advantage by reducing filter length by more than four-fold. By using wavelet filters, you can now compensate for linear and non-linear impairments in an optical communication link in the electronic domain. Electronic filtering provides a simplicity that physical domain compensation systems cannot offer, while offering the capability to retrofit to existing networks.

*Principal Investigator

Name: Dr. Gilad Goldfarb

Department:

Name: Dr. Guifang Li

Department:

Country/Region

USA