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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 20071–20077

Optical 16-QAM-52-OFDM transmission at 4 Gbit/s by directly modulating a coherently injection-locked colorless laser diode

Yu-Chieh Chi, Yi-Cheng Li, Huai-Yung Wang, Peng-Chun Peng, Hai-Han Lu, and Gong-Ru Lin  »View Author Affiliations


Optics Express, Vol. 20, Issue 18, pp. 20071-20077 (2012)
http://dx.doi.org/10.1364/OE.20.020071


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Abstract

Coherently injection-locked and directly modulated weak-resonant-cavity laser diode (WRC-FPLD) for back-to-back optical 16-quadrature-amplitude-modulation (QAM) and 52-subcarrier orthogonal frequency division multiplexing (OFDM) transmission with maximum bit rate up to 4 Gbit/s at carrier frequency of 2.5 GHz is demonstrated. The WRC-FPLD transmitter source is a specific design with very weak-resonant longitudinal modes to preserve its broadband gain spectral characteristics for serving as a colorless WDM-PON transmitter. Under coherent injection-locking, the relative-intensity noise (RIN) of the injection-locked WRC-FPLD can be suppressed to −105 dBc/Hz and the error vector magnitude of the received optical OFDM data is greatly reduced with the amplitude error suppressed down 5.5%. Such a coherently injection-locked single-mode WRC-FPLD can perform both the back-to-back and the 25-km-SMF 16-QAM-52-OFDM transmissions with a symbol rate of 20-MSa/s in each OFDM subcarrier. After coherent injection locking, the BER of the back-to-back transmitted 16-QAM-52-OFDM data is reduced to 2.5 × 10−5 at receiving power of −10 dBm. After propagating along a 25-km-long SMF, a receiving power sensitivity of −7.5 dBm is required to obtain a lowest BER of 2.5 × 10−5, and a power penalty of 2.7 dB is observed when comparing with the back-to-back transmission.

© 2012 OSA

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4080) Fiber optics and optical communications : Modulation
(140.3520) Lasers and laser optics : Lasers, injection-locked

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: May 14, 2012
Revised Manuscript: July 4, 2012
Manuscript Accepted: July 15, 2012
Published: August 17, 2012

Citation
Yu-Chieh Chi, Yi-Cheng Li, Huai-Yung Wang, Peng-Chun Peng, Hai-Han Lu, and Gong-Ru Lin, "Optical 16-QAM-52-OFDM transmission at 4 Gbit/s by directly modulating a coherently injection-locked colorless laser diode," Opt. Express 20, 20071-20077 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-18-20071


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References

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