Presentation 2009-05-29
Optical Coherence Domain Reflectometry Using Optical Frequency Comb
Zuyuan He, Hiroshi Takahashi, Kazuo Hotate,
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Abstract(in English) Various kinds of optical fiber reflectometries are developed with rapidly improved performance as a technology to diagnose the breakdown points in fiber optic networks/devices. As a unique technique, the reflectometry by synthesis of optical coherence function (SOCF) has been studied intensively in this laboratory. So far, km-order measurement range, cm-order spatial resolution, 45-dB dynamic range, and less-than-5-second measurement time have been achieved in the reflectometry by SOCF. However, these performances cannot be realized at the same time, mainly due to the modulation schemes of the light source: sinusoidal modulation or stepwise modulation. In this report, we propose an optical coherence domain reflectometry (OCDR) using an optical frequency comb as the light source, which enables high spatial resolution, large dynamic range, and fast measurement speed at the same time. The comb interval of the optical frequency comb used for this proposed technique should be adjustable over broad range. To do so, optical frequency comb whose comb interval is changeable was generated by using a fiber ring resonator and a phase modulator. The comb interval was able to be changed from 40MHz to 80MHz. In basic experiments, we succeeded in measuring the reflectivity of adjacent PC and APC connectors that was not able to be measured with a reflectometry by sinusoidal modulation SOCF due to insufficient dynamic range. In the experiment on OCDR using optical frequency comb, we succeeded in reflectivity distribution measurement with 5-cm spatial resolution, over 45-dB dynamic range, and 10-second measurement time at the same time.
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Keyword(in English) optical reflectometry / optical coherence / OCDR / optical frequency comb / reflectivity
Paper # OFT2009-12
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Conference Information
Committee OFT
Conference Date 2009/5/21(1days)
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Paper Information
Registration To Optical Fiber Technology (OFT)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Optical Coherence Domain Reflectometry Using Optical Frequency Comb
Sub Title (in English)
Keyword(1) optical reflectometry
Keyword(2) optical coherence
Keyword(3) OCDR
Keyword(4) optical frequency comb
Keyword(5) reflectivity
1st Author's Name Zuyuan He
1st Author's Affiliation Department of Electrical Engineering and Information Systems, The University of Tokyo()
2nd Author's Name Hiroshi Takahashi
2nd Author's Affiliation Department of Electrical Engineering and Information Systems, The University of Tokyo
3rd Author's Name Kazuo Hotate
3rd Author's Affiliation Department of Electrical Engineering and Information Systems, The University of Tokyo
Date 2009-05-29
Paper # OFT2009-12
Volume (vol) vol.109
Number (no) 59
Page pp.pp.-
#Pages 6
Date of Issue