Method and apparatus for testing optical fiber by using...

Details Method and apparatus for testing optical fiber by using... Method and apparatus for testing optical fiber by using...

2006-06-20

2006-06-20

Pak, Sung (Department: 2874)

Optical waveguides

Miscellaneous

C356S039000, C380S034000, C375S213000

Reexamination Certificate

active

07065286

ABSTRACT:
Disclosed is a method and an apparatus for testing an optical fiber by using a biorthogonal codes and a Moore-Penrose inverse matrix. The method includes the steps of: (a) coding 2n optical pulses according to each codeword of the n-bit biorthogonal code matrix (2n*n matrix), injecting the coded optical pulses into an optical fiber, and measuring 2n optical signals generated when the coded optical pulses are reflected from the optical fiber; (b) decoding the 2n optical signals measured in step (a) by means of the Moore-Penrose inverse matrix (n*2n matrix) for the n-bit biorthogonal code matrix, thereby restoring n signals; (c) shifting the n signals along the time axis to remove timing differences among the n signals; and (d) performing an average operation for the time-shifted n signals and obtaining a final measured value.

REFERENCES:
Receiver Structure of Generalized M-ary Optical DPSK System And Its Semi-analytical Performance Evaluation, Hosung Yoon, Duckey Lee and Namkyoo Park□□paper 14C3-4, OECC 2004, Yokohama, Jul., 2004.
SNR Improvement of a Non-Coherent OTDR Using Biorthogonal Codes and Moore-Penrose Generalized Inverses, Duckey Lee, Hosung Yoon, Na Young Kim, and Namkyoo Park□□paper We4, ECOC 2004, Stockholm, Sep., 2004.

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