Chinese Optics Letters, 2016, 14 (5): 050605, Published Online: Aug. 6, 2018
Coherent ONU based on 850 μm-long cavity-RSOA for next-generation ultra-dense access network
060.1660 Coherent communications 250.5980 Semiconductor optical amplifiers 060.2330 Fiber optics communications 060.4250 Networks
Abstract
In this Letter, an efficient bidirectional differential phase-shift keying (DPSK)—DPSK transmission for a ultra-dense wavelength division-multiplexed passive optical network is proposed. A single distributed feedback laser at the optical network unit (ONU) is used both as the local laser for downlink coherent detection and the optical carrier for uplink. Phase-shift keying is generated using a low-cost reflective semiconductor optical amplifier (RSOA) at the ONU. The RSOA chip has the bandwidth of 4.7 GHz at the maximum input power and bias current. For uplink transmission, the sensitivity of the RSOA chip reaches 48.2 dBm at the level of bit error rate = 10 3 for back-to-back, and the penalty for 50 km transmission is less than 1 dB when using polarization diversity.
Guang Yong Chu, Adolfo Lerín, Iván N. Cano, Victor Polo, Josep Prat. Coherent ONU based on 850 μm-long cavity-RSOA for next-generation ultra-dense access network[J]. Chinese Optics Letters, 2016, 14(5): 050605.