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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 26 — Dec. 12, 2011
  • pp: B756–B763

Multipath interference test method using synthesized chirped signal from directly modulated DFB-LD with digital-signal-processing technique

Kazuo Aida and Toshihiko Sugie  »View Author Affiliations

Optics Express, Vol. 19, Issue 26, pp. B756-B763 (2011)

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We propose a method of testing transmission fiber lines and distributed amplifiers. Multipath interference (MPI) is detected as a beat spectrum between a multipath signal and a direct signal using a synthesized chirped test signal with lightwave frequencies of f1 and f2 periodically emitted from a distributed feedback laser diode (DFB-LD). This chirped test pulse is generated using a directly modulated DFB-LD with a drive signal calculated using a digital signal processing technique (DSP). A receiver consisting of a photodiode and an electrical spectrum analyzer (ESA) detects a baseband power spectrum peak appearing at the frequency of the test signal frequency deviation (f1-f2) as a beat spectrum of self-heterodyne detection. Multipath interference is converted from the spectrum peak power. This method improved the minimum detectable MPI to as low as −78 dB. We discuss the detailed design and performance of the proposed test method, including a DFB-LD drive signal calculation algorithm with DSP for synthesis of the chirped test signal and experiments on single-mode fibers with discrete reflections.

© 2011 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2300) Fiber optics and optical communications : Fiber measurements
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements

ToC Category:
Fibers, Fiber Devices, and Amplifiers

Original Manuscript: September 28, 2011
Revised Manuscript: November 22, 2011
Manuscript Accepted: November 23, 2011
Published: December 6, 2011

Virtual Issues
European Conference on Optical Communication 2011 (2011) Optics Express

Kazuo Aida and Toshihiko Sugie, "Multipath interference test method using synthesized chirped signal from directly modulated DFB-LD with digital-signal-processing technique," Opt. Express 19, B756-B763 (2011)

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