Optical fiber equalizer
Abstract
Abstract BECAUSE OF IMPERFECTIONS IN OPTICAL FIBERS, LIGHT PROPAGATING THEREALONG IS CONTINUOUSLY BEING SCATTERED AND RESCATTERED. SOME OF THIS SCATTERED ENERGY IS TRAPPED WITHIN THE FIBER IN A PROPAGATING MODE AND ULTIMATELY REACHES THE OUTPUT OF THE FIBER DELAYED RELATIVE TO THE INPUT SIGNAL. IT IS SHOWN THAT THE DOUBLE-REVERSE SCATTERING RESPONSE OF A FIBER IS VERY NEARLY THE SAME AS THE RESPONSE OF AN R-C INTEGRATOR FOR THE SAME INPUT. ACCORDINGLY, THE EFFECTS OF DOUBLE-REVERSE SCATTERING INTERFERENCE CAN BE SUBSTANTIALLY REDUCED BY PASSING A PORTION OF THE RECEIVED SIGNAL THROUGH AN R-C INTEGRATOR AND INJECTING THE INTEGRATED SIGNAL THUS PRODUCED BACK INTO THE MAIN SIGNAL PATH IN TIME COINCIDENCE WITH THE SIGNAL SO AS TO CANCEL THE INTERFERENCE COMPONENT.
Inventors
- 👤 W Hubbard
- 👤 T Li
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
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| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
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