Abstract
We demonstrate a novel long-reach PON downstream scheme based on the regenerated pilot assisted direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) superchannel transmission. We use the optical comb source to form DDO-OFDM superchannel, and reserve the center carrier as a seed pilot. The seed pilot is further tracked and reused to generate multiple optical carriers at the local exchange. Each regenerated pilot carrier is selected to beat with an adjacent OFDM sub-band at ONU, so that the electrical bandwidth limitation can be much released compared to the conventional DDO-OFDM superchannel detection. With the proposed proof-of-concept architecture, we experimentally demonstrated a 116.7 Gb/s superchannel OFDM-PON system with transmission reach of 100 km, and 1:64 splitting ratio. We analyze the impact of carrier-to-sideband power ratio (CSPR) on system performance. The experiment result shows that, 5 dB power margin is still remained at ONU using such technique.
Highlights
The long-reach passive optical network (LR-PON) enables network operators and service providers to deliver wide-bandwidth traffic to a vast number of end users at a low cost by exploiting optical amplification in combination with wavelength division multiplexing (WDM)
Compared to back-to-back, there is about 1.2 dB degradation for the optimum Q factor, which is mainly due to the increased amplified spontaneous emission (ASE) noise from the EDFA
The optimum carrier-to-sideband power ratio (CSPR) after transmission decreases slightly, which agrees with the results reported in [13]
Summary
The long-reach passive optical network (LR-PON) enables network operators and service providers to deliver wide-bandwidth traffic to a vast number of end users at a low cost by exploiting optical amplification in combination with wavelength division multiplexing (WDM). The consolidation of metro/access networks reduces the number of active optical network interfaces and elements in the field, minimizes network planning. This in turn lowers capital expenditure (CAPEX) and operational expenditure (OPEX) of the integrated network [1,2,3]. Qian et al proposed and experimentally demonstrated a single-side band 43.6-Gb/s downstream OFDMA-PON using 64/32/16QAM signals and direct detection [10]. Yan et al proposed a double-sided DDO-OFDM downstream scheme, which transmitted an aggregated data rate of 120 Gb/s using less than 25 GHz single-end receiver [11]
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