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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29838–29843

A wideband 360° photonic-assisted microwave phase shifter using a polarization modulator and a polarization-maintaining fiber Bragg grating

Wangzhe Li, Weifeng Zhang, and Jianping Yao  »View Author Affiliations


Optics Express, Vol. 20, Issue 28, pp. 29838-29843 (2012)
http://dx.doi.org/10.1364/OE.20.029838


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Abstract

A novel approach to implementing a wideband microwave photonic phase shifter by a joint use of a polarization modulator (PolM) and a polarization-maintaining fiber Bragg grating (PM-FBG) is proposed and experimentally demonstrated. A microwave signal to be phase shifted is applied to the PolM. Two phase-modulated signals along the two principal axes of the PolM are generated and sent to the PM-FBG. The phase-modulated signals have a static but complementary phase shift introduced by the dc bias applied to the PolM. Due to the birefringence of the polarization-maintaining (PM) fiber, the PM-FBG has two spectrally separated and orthogonally polarized reflection bands. By employing the PM-FBG to reflect one first-order sideband along one polarization direction and one optical carrier along the other polarization direction, and send them back to the PolM, a second-time phase modulation is imposed to the sideband and the optical carrier. By sending the two signals to a polarizer and beating them at a photodetector, a phase shifted microwave signal is obtained. Since the PolM is used twice, a low dc bias voltage would lead to a large phase shift. A full 360° microwave photonic phase shifter over a frequency range of 30-40 GHz is experimentally demonstrated. The spurious free dynamic range (SFDR) of the phase shifter is also studied.

© 2012 OSA

OCIS Codes
(350.4010) Other areas of optics : Microwaves
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(060.5625) Fiber optics and optical communications : Radio frequency photonics
(250.4110) Optoelectronics : Modulators

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: November 5, 2012
Revised Manuscript: December 14, 2012
Manuscript Accepted: December 14, 2012
Published: December 21, 2012

Citation
Wangzhe Li, Weifeng Zhang, and Jianping Yao, "A wideband 360° photonic-assisted microwave phase shifter using a polarization modulator and a polarization-maintaining fiber Bragg grating," Opt. Express 20, 29838-29843 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-28-29838


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