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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 4990–4993

Photonic downconversion based on optical carrier bidirectional reusing in a phase modulator

Tianwei Jiang, Song Yu, Qian Xie, Jian Li, and Wanyi Gu  »View Author Affiliations


Optics Letters, Vol. 39, Issue 17, pp. 4990-4993 (2014)
http://dx.doi.org/10.1364/OL.39.004990


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Abstract

We propose a novel photonic downconversion method based on optical carrier reusing. In the proposed system, the phase modulator (PM) is placed between two narrowband fiber Bragg gratings (FBGs), which are designed to reflect the optical carrier and transmit the optical sidebands. The optical carrier is modulated in the PM in two directions and is not injected into the photodetector (PD). Thus, the utilization ratio of the optical carrier is enhanced and the power saturation in the PD is avoided. Consequently, the system gain can be improved. In addition, a 2×2 optical coupler is cooperated with a balanced PD behind these two FBGs. Resulting from the subtle design of the phase difference, gain is furthermore doubled and intensity noise can be reduced simultaneously. In the experiments, 29 dB gain improvement is measured compared with the traditional dual-series intensity modulators method. The noise floor is reduced by 12.1 dB.

© 2014 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 3, 2014
Revised Manuscript: July 19, 2014
Manuscript Accepted: July 21, 2014
Published: August 18, 2014

Citation
Tianwei Jiang, Song Yu, Qian Xie, Jian Li, and Wanyi Gu, "Photonic downconversion based on optical carrier bidirectional reusing in a phase modulator," Opt. Lett. 39, 4990-4993 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-17-4990


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