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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 13 — Jun. 30, 2014
  • pp: 15724–15736

Suppressing the relaxation oscillation noise of injection-locked WRC-FPLD for directly modulated OFDM transmission

Min-Chi Cheng, Yu-Chieh Chi, Yi-Cheng Li, Cheng-Ting Tsai, and Gong-Ru Lin  »View Author Affiliations

Optics Express, Vol. 22, Issue 13, pp. 15724-15736 (2014)

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By up-shifting the relaxation oscillation peak and suppressing its relative intensity noise in a weak-resonant-cavity Fabry-Perot laser diode (WRC-FPLD) under intense injection-locking, the directly modulated transmission of optical 16 quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) data-stream is demonstrated. The total bit rate of up to 20 Gbit/s within 5-GHz bandwidth is achieved by using the OFDM subcarrier pre-leveling technique. With increasing the injection-locking power from −12 to −3 dBm, the effective reduction on threshold current of the WRC-FPLD significantly shifts its relaxation oscillation frequency from 5 to 7.5 GHz. This concurrently induces an up-shift of the peak relative intensity noise (RIN) of the WRC-FPLD, and effectively suppresses the background RIN level to −104 dBc/Hz within the OFDM band between 3 and 6 GHz. The enhanced signal-to-noise ratio from 16 to 20 dB leads to a significant reduction of bit-error-rate (BER) of the back-to-back transmitted 16-QAM-OFDM data from 1.3 × 10−3 to 5 × 10−5, which slightly degrades to 1.1 × 10−4 after 25-km single-mode fiber (SMF) transmission. However, the enlarged injection-locking power from −12 to −3 dBm inevitably declines the modulation throughput and increases its negative throughput slope from −0.8 to −1.9 dBm/GHz. After pre-leveling the peak amplitude of the OFDM subcarriers to compensate the throughput degradation of the directly modulated WRC-FPLD, the BER under 25-km SMF transmission can be further improved to 3 × 10−5 under a receiving power of −3 dBm.

© 2014 Optical Society of America

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:
Optical Communications

Original Manuscript: September 27, 2013
Revised Manuscript: January 16, 2014
Manuscript Accepted: February 3, 2014
Published: June 20, 2014

Min-Chi Cheng, Yu-Chieh Chi, Yi-Cheng Li, Cheng-Ting Tsai, and Gong-Ru Lin, "Suppressing the relaxation oscillation noise of injection-locked WRC-FPLD for directly modulated OFDM transmission," Opt. Express 22, 15724-15736 (2014)

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