Dual-Carrier 1-Tb/s Transmission Over Field-Deployed G.654.E Fiber Link Using Real-Time Transponder

Abstract

We demonstrated 1-Tb/s-class transmissions of fielddeployed large-core low-loss fiber links, which is compliant with ITU-T G.654.E, using our newly developed real-time transponder consisting of a state-of-the-art 16-nm complementary metal-oxide-semiconductor (CMOS) based digital signal processing application-specific integrated circuit (DSP-ASIC) and an indium phosphide (InP) based high-bandwidth coherent driver modulator (HB-CDM). In this field experiment, we have achieved record transmission distances of 1122 km for net data-rate 1-Tb/s transmission with dual polarization-division multiplexed (PDM) 32 quadrature amplitude modulation (QAM) signals, and of 336.6 km for net data-rate 1.2-Tb/s transmission with dual PDM-64QAM signals. This is the first demonstration of applying hybrid erbium-doped fiber amplifier (EDFA) and backward-distributed Raman amplifier were applied to terrestrial G.654.E fiber links. We also confirmed the stability of signal performance over field fiber transmission in wavelength division multiplexed (WDM) condition. The Q-factor fluctuations respectively were only less than or equal to 0.052 dB and 0.07 dB for PDM-32QAM and PDM-64QAM signals within continuous measurements for 60 minutes.

Coherent Optical Transceivers Scaling and Integration Challenges

“…Early solutions for 400 Gb/s per channel were offered by the dual-carrier 32-GBd-class 16QAM signal [30]. Recently, the net rates per wavelength of commercially available transceivers have been increased up to 600 Gb/s using 64-GBd-class 64QAM signals [31], [32], [33] and 800 Gb/s using 100-GBd-class with 16QAM signals [34]. In [34], a 1.6-Tb/s transceiver with PICs and one DSP ASIC chip for the dual-carrier signal, which can offer 2 × 800 Gb/s/λ, has been reported.…”

Two-Dimensional Transmission of Four-Dimensional LDPC-Coded Modulation with Slepian Sequences for DSP-Free 40 km Metro Network Applications

“…While the demands of different modulation formats applications are increasing, a DSP application-specific integrated circuit (ASIC) is also required to support multi-modulation and multi-rate formats [25]. Researchers have already investigated DSP-ASIC to support QAM modulation formats with different constellation points for different data rate transmissions [25][26][27]. The constellation shaping scheme, both probabilistic shaping (PS) and geometric shaping (GS), are broadly applied to reduce the gap of channel capacity to Shannon limit, which also require specified DSP scheme to optimize the performance [28,29].…”