Symmetric 40-Gb/s TWDM-PON With 39-dB Power Budget

Abstract

Time-and wavelength-division multiplexed passive optical network (TWDM-PON) has been selected by full service access networks as a primary solution for next generation PON stage 2 in April 2012. In this letter, we propose and demonstrate a symmetric 40-Gb/s TWDM-PON with 39-dB power budget. A reflective semiconductor optical amplifier is used in optical network unit as a pre-amplifier to enhance the sensitivity of downstream signals. For the upstream direction, a thermallytuned directly modulated laser with 10-Gb/s modulation rate is used as upstream colorless source, and a chirp management filter is employed in optical line terminal to mitigate chromatic dispersion therefore enabling fiber transmission. Symmetric 40-Gb/s TWDM-PON is experimentally demonstrated with a power budget of 39 dB, which could support 25-km fiber transmission and 1:1000 splitting ratio.

Asymmetrical TWDM-PON with 4 × 25-Gb/s downstream DSB OFDM and 4 × 10-Gb/s upstream OOK modulations

“…The pre-amplification performance of the RSOA is similar with that of semiconductor optical amplifier (SOA) and worse than that of EDFA, but the cost is lowest among them. Therefore, the RSOA is more suitable for cost-sensitivity ONU [11]. After the RSOA, the OFDM signal is detected by a photodiode and then amplified by an electrical amplifier (EA) before sampled by a real time digital storage oscilloscope operating at 50-GS/s.…”

“…From then, various TWDM-PON have been proposed to support 40-Gb/s data rate [8][9][10][11][12]. As the growth of users' demand, the main target of future high-capacity PON system is to provide high access rate and more number of subscribers [13][14][15].…”

Recent development on time and wavelength-division multiplexed passive optical network (TWDM-PON) for next-generation passive optical network stage 2 (NG-PON2)

“…A TOF is utilized to manage chirp laser and select the downstream wavelengths. Lilin [52] further optimized the power budget by removing the chirp management filter from ONU to OLT, right after the preamplifier for upstream signals. The impact of filter insertion loss on the upstream power budget can be reduced, thereby achieving a higher system power budget.…”

New RoF-PON architecture using polarization multiplexed wireless MIMO signals for NG-PON

“…In addition, NG-PON must support at least 40 Gb/s aggregate capacity per feeder fiber downstream (DS) [5]. For NG-PON, time and wavelength-division multiplexed PON (TWDM-PON) has been selected by full services access network (FSAN) group as a primary solution [6]. The difference between a typical hybrid TDM-WDM PON and TWDM-PON is illustrated in Fig.…”