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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15692–15697

Dynamic range improvement of a microwave photonic link based on bi-directional use of a polarization modulator in a Sagnac loop

Wangzhe Li and Jianping Yao  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15692-15697 (2013)

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A novel microwave photonic link (MPL) with an improved spurious-free dynamic range (SFDR) based on a bidirectional use of a polarization modulator (PolM) in a Sagnac loop is proposed and demonstrated. The PolM in the loop functions, in conjunction with a polarization controller and a polarization beam combiner, as a Mach Zehnder modulator (MZM), which only modulates the incident light wave along the clockwise direction, leaving the counter-clockwise light wave unmodulated due to the velocity mismatch. Two clockwise intensity-modulated signals along two paths (Path 1 and Path 2) are generated, with one (Path 2) combined with the non-modulated light wave from the counter-clockwise direction to suppress part of the optical carrier. By controlling the power relationship between the two paths, the third-order intermodulation distortion (IMD3) can be fully suppressed, and thus an MPL with improved dynamic range is achieved. A theoretical analysis is presented, which is validated by an experiment. The IMD3 can be suppressed by 50 dB, giving an improvement in SFDR of 16 dB.

© 2013 OSA

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(350.4010) Other areas of optics : Microwaves
(060.5625) Fiber optics and optical communications : Radio frequency photonics
(130.4110) Integrated optics : Modulators

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 10, 2013
Revised Manuscript: June 10, 2013
Manuscript Accepted: June 10, 2013
Published: June 24, 2013

Wangzhe Li and Jianping Yao, "Dynamic range improvement of a microwave photonic link based on bi-directional use of a polarization modulator in a Sagnac loop," Opt. Express 21, 15692-15697 (2013)

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