Author_Institution :
Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
In this paper, we propose and investigate an injection-locked Fabry-Pérot laser diode (FP-LD) with 10% front-facet reflectivity by using orthogonal frequency-division multiplexing-quadrature amplitude modulation (OFDM-QAM) in each optical network unit (ONU) for colorless operation in the carrier-distributed passive optical network (PON). Here, the 10-Gb/s 16-QAM OFDM upstream traffic can be generated via a 2.5-GHz-bandwidth injection-locked FP-LD for the short-reach (SR)-to-long-reach (LR) transmission. In this measurement, the CW injection power of -12 dBm for an injection-locked FP-LD is required to achieve 100-km single-mode fiber (SMF) transmission. Hence, error-free transmissions of 20-, 50-, 75-, and 100-km fiber lengths are achieved with the power penalties of 0.33, 0.86, 1.20, and 1.76 dB at the bit error rate (BER) of 3.8 × 10-3, respectively, for upstream traffic. Moreover, the relationship of CW injection power and signal-to-noise ratio (SNR) of each OFDM subcarrier in the injection-locked FP-LD has also been analyzed.
Keywords :
OFDM modulation; laser mode locking; optical communication equipment; passive optical networks; quadrature amplitude modulation; semiconductor lasers; 16-QAM OFDM upstream traffic; OFDM-QAM; PON access; bandwidth 2.5 GHz; carrier distributed passive optical network; colorless operation; distance 100 km; distance 25 km; distance 50 km; distance 75 km; front facet reflectivity; injection locked Fabry-Perot laser diode; long reach upstream; optical network unit; orthogonal frequency division multiplexing; quadrature amplitude modulation; short reach upstream; single mode fiber transmission; Current measurement; OFDM; Optical network units; Passive optical networks; Reflectivity; Signal to noise ratio; Temperature measurement; Fabry–Pérot laser diode (FP-LD); Mode-locked; orthogonal frequency-division multiplexing (OFDM);
