We demonstrate a long-reach wavelength-division-multiplexed passive optical network (WDM PON) operating at the symmetric rate of 10.3 Gb/s. For the cost-effectiveness, we realize the upstream transmission by utilizing directly-modulated TO-can packaged reflective semiconductor optical amplifiers (RSOAs) and digital coherent receivers. In addition, to overcome the limited modulation bandwidth of this TO-can packaged RSOA (~2.2 GHz) and operate it at 10.3 Gb/s, we utilize the quadrature phase shift keying (QPSK) format and the electronic phase equalization technique. The result shows that we can extend the maximum reach of the 10.3-Gb/s RSOA-based WDM PON to ~80 km without using any remote amplifiers.

Long-reach 10-Gb/s RSOA-based WDM PON employing QPSK signal and coherent receiver

Reflective semiconductor optical amplifier (RSOA) is considered a strong candidate to play an important role in realizing the next generation wavelength division multiplexing passive optical network, based on the wavelength reuse concept. Therefore, an accurate and efficient modeling of RSOA is of significant importance. We present a time-domain wideband model for simulation of spatial and temporal distribution of photons and carriers in a bulk RSOA. We provide a novel approach for efficient amplified spontaneous emission modeling, considering a tradeoff between the accuracy and the computational efficiency. The multiobjective genetic algorithm is utilized for parameter extraction. Experimental validation has been performed for continuous wave input, nonreturn to zero (NRZ) on-off keying, and quadrature phase-shift keying (QPSK) signaling pulses up to 40 Gb/s of bit rate, in both amplification and remodulation regimes. We further present systematic performance evaluation under remodulation scenario. Saturation, noise, chirp, and signal broadening are successfully predicted, while reducing the computational time compared to other wideband models.

/pdf/efficient-dynamic-modeling-of-the-reflective-semiconductor-g9xtulrvld.pdf

Efficient Dynamic Modeling of the Reflective Semiconductor Optical Amplifier

A homodyne coherent receiver for ultra-dense WDM-PON with off the shelf components is presented. It consists of a conventional DFB, phase switched clock signal, an optical coupler instead of a 90° hybrid, balanced photodetectors and digital signal processing. The phase swing for a DBPSK signal was optimized and the performance was experimentally evaluated in terms of the sensitivity for several laser linewidths. The acceptable frequency offset and clock time delay was also assessed. The results exhibit a sensitivity of -48 dBm at a BER of 10(-3) and indicate a high tolerance to phase noise.

Simple intradyne PSK system for UDWDM-PON

We investigate the power budget of a fully coherent reflective passive optical network, based on self-coherent upstream (US) and self-homodyne downstream (DS) detection schemes. We consider, for US, both binary phase-shift keyed (BPSK) and quadrature phase-shift keyed (QPSK) at 1 GBd generated by direct modulation of a low-cost reflective semiconductor optical amplifier having 1-GHz electrical bandwidth and using simplified digital signal processing (DSP). We find that the penalty of increasing the order of US modulation format from BPSK to QPSK for higher capacity can be reduced to 1 dB by means of DS digital spectral shifting and US static postequalization.

Self-Homodyne Detection-Based Fully Coherent Reflective PON Using RSOA and Simplified DSP

In this paper, the requirements for next generation passive optical network (NG-PON) and evolution trends of PON are analyzed. Based on the analysis of the requirements for NGPON and the characteristics of various potential NG-PON schemes, it is believed that hybrid TDM/WDM PON will be the most promising candidate NG-PON schemes for different application scenes in the near future, and the OFDM PON and coherent PON are the most suitable solutions for the far future to satisfy the requirements of ultra-high capacity, higher split ratio, and wider coverage. The key techniques enabling NG-PON are also described in the last.

The evolution trends of PON and key techniques for NG-PON

We demonstrate 10-Gb/s, 80-km-reach RSOA-based WDM PON by utilizing the digital coherent detection and electronic phase equalization techniques. The upstream signal is obtained by directly modulating a TO-can packaged RSOA with 10-Gb/s QPSK signal.

10-Gb/s, 80-km reach RSOA-based WDM PON employing QPSK signal and self-homodyne receiver

We propose and demonstrate a simple technique to generate 10-Gb/s QPSK signal by directly modulating an RSOA with instantaneous injection/depletion currents. No electronic equalization technique is needed to overcome the limited bandwidth of the RSOA.

Upstream transmission of 10-Gb/s QPSK signal generated by directly modulating RSOA with instantaneous injection/depletion currents in coherent WDM PON

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10-Gb/s, 80-km reach RSOA-based WDM PON employing QPSK signal and self-homodyne receiver

Upstream transmission of 10-Gb/s QPSK signal generated by directly modulating RSOA with instantaneous injection/depletion currents in coherent WDM PON