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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 36, Iss. 23 — Dec. 1, 2011
  • pp: 4602–4604

I/Q intensity-demodulation analog photonic link based on polarization modulator

Qiang Lv, Kun Xu, Yitang Dai, Yan Li, Jian Wu, and Jintong Lin  »View Author Affiliations

Optics Letters, Vol. 36, Issue 23, pp. 4602-4604 (2011)

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We experimentally investigate a high-linearity analog photonic link based on polarization-modulation in-phase/quadrature ( I / Q ) intensity-demodulation. In the proposed system, a light wave with its polarization direction oriented at an angle of 45 ° with respect to the principal axis of the polarization modulator (PolM) is polarization modulated by a drive signal. In the receiver, the polarization-modulated signal is split into two paths using a 50 50 optical coupler (OC). In each path, a polarization beam splitter (PBS) is connected to the PolM via a polarization controller (PC) to realize the in-phase and quadrature signal, respectively. Thanks to the polarization-modulation to intensity- modulation conversion, the fluctuation of the optical phase noise has no impact on the coherent signals. In addition, the use of a single PolM allows the link avoids the matching requirements of dual modulator schemes. The linearization leads to suppression of the third-order intermodulation (IMD3) by more than 40 dB , compared to the quadrature signal. Experimental results show that the link gain is 11.5 dB , noise figure is 26.5 dB , and the third-order limited spurious free dynamic range (SFDR) is 124 dB in a 1 Hz bandwidth.

© 2011 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.4080) Fiber optics and optical communications : Modulation
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 6, 2011
Revised Manuscript: October 16, 2011
Manuscript Accepted: October 17, 2011
Published: November 28, 2011

Qiang Lv, Kun Xu, Yitang Dai, Yan Li, Jian Wu, and Jintong Lin, "I/Q intensity-demodulation analog photonic link based on polarization modulator," Opt. Lett. 36, 4602-4604 (2011)

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