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 propose a simple carrier phase estimation technique for the phase-modulated signal generated by using bandwidth-limited RSOA. By using this technique, we demonstrate 25.78-Gb/s QPSK upstream transmission in 60-km reach coherent RSOA-based WDM PON.

/pdf/a-simple-carrier-phase-estimation-technique-for-high-speed-4hx7fieum3.pdf

A simple carrier-phase estimation technique for high-speed RSOA-based coherent WDM PON

This paper reviews various state-of-the-art techniques exploited to extend reach and accelerate bit-rate of RSOA-based WDM PON system for overcoming the underlying issues due to RSOA's narrow modulation bandwidth.

RSOA-based long-reach WDM PON using digital coherent receivers

Using WDM multiplexing is one of the ways to increase PON bandwidth. But as WDM-PON is still expensive and difficult administered, the idea of using a Reflective Semiconductor Optical Amplifier (RSOA) is proposed. It can be installed in WDM-PON ONU network devices. A comprehensive problem analysis of various investigations is done relating to a performance of RSOA-based WDM-PON systems. The simulation model is created for RSOA-based WDM-PON access with downstream signal reusing in ONU for upstream transmission. This model helped in researching of RSOA abilities using different downstream and upstream signals modulation. Signal parameters were tested working with special software OptiSystem. Results were evaluated regarding such a characteristics as Q factor, signal attenuation, power and optical fiber length. It was found that RZ code was better suited in remodulation with RSOA; it achieved 1.25 Gbps signal transmission at a distance 8 times larger than that of the in NRZ code case. DOI: http://dx.doi.org/10.5755/j01.eie.22.2.14601

/pdf/a-problem-analysis-of-rsoa-based-optical-access-3ub6iwv9ly.pdf

A Problem Analysis of RSOA-Based Optical Access

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