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We generated a 500-Gb/s AO-OFDM signal with DP-16QAM modulating each subcarrier and detected the signal using coherent detection. We investigated the effects of DSP oversampling and receiver bandwidth using experimental results and numerical simulations.
We propose a coded N-dimensional pulse-amplitude modulation (ND-PAM) suitable for ultra-high-speed serial optical transport. The polarization-multiplexed-ND-PAM significantly outperforms corresponding polarization-multiplexed-QAM counterpart in terms of OSNR sensitivity (>; 4 dB at symbol rate 31.25 GS/s), while enabling beyond 400 Gb/s transmission.
The first experimental demonstration of nonbinary-LDPC-coded optical transmission is presented. Using DQPSK, we can achieve >;8dB and ~10dB net coding gains at the BER of 10-6 in the absence and presence of I/Q imbalance, respectively.
We introduce the network defragmentation problem for FWDM networks, formulate it, and propose heuristics. The network defragmentation process consolidates the available spectrum significantly while minimizing the number of interrupted connections.
High-speed transmission at 42.8 Gb/s over 640-km SMF-28 with dispersion compensation at 1550 nm using a directly modulated chirp-managed laser (CML) has been demonstrated. The large dispersion tolerance has also been probed in this paper.
In this paper, we experimentally demonstrate 22.4-Gb/s optical OFDM transmission over 1000 km SSMF with polarization multiplexing (POLMUX) and direct detection. To the best of our knowledge, this is the longest reach directly-detected POLMUX-OFDM experiment reported.
We present two PMD compensation schemes suitable for use in multilevel block-coded modulation schemes with coherent detection: (i) Bell Laboratories layered space-time architecture (BLAST)-type polarization-interference cancellation scheme, and (ii) iterative polarization cancellation scheme.
Employing PolMux-RZ-8PSK modulation and coherent detection, we demonstrate 25 GHz-spaced, 161times114 Gb/s DWDM transmission through eight spans of ultra-low-loss fiber (average span length/loss of 82.75 km/14.6 dB) with a record capacity of 17 Tb/s (spectral efficiency 4.2 b/s/Hz) within the C-band EDFA bandwidth (4.025 THz).
We report the first experimental demonstration of 10 Gb/s free-space optical transmission using orthogonal frequency division multiplexing (OFDM). The OFDM system provides superior performance, with a 3 dB improvement in receiver sensitivity over NRZ OOK.
Several LDPC-codes with rate above 0.9 are proposed, and employed in PMD- compensation by LDPC-coded turbo-equalization. The block-circulant LDPC(15328,13893) is only 1.25 dB away from the channel-capacity limit for DGD of 125 ps (and NRZ transmission at 10- Gb/s).
We propose a new coherent optical OFDM system architecture using self optical carrier extraction. It requires simplified DSP at the coherent receiver. The system shows good tolerance to phase noise, laser linewidth, and fiber nonlinearity.
We have experimentally demonstrated optically labeled 100 Gbit/s packet signals passing through 8 straight-line OWSS nodes and 240 km transmission fiber for the first time. The BER performance for the optical packet signals after transmission and switching has been evaluated.
We proposed a novel I/Q multiplexing technique for high-speed optical OFDM using complementary spectral coding. By providing code orthogonality close to coherent OCDMA, we simulated the transmission of 16-QAM OFDM at ~30 Gb/s for PON applications.
An iterative bandwidth-efficient coded modulation scheme based on bit-interleaving, block-circulant low-density parity-check (LDPC) codes, and Many differential phase-shift keying suitable for high-speed transmission at 100 Gb/s (and above) is proposed.
In this paper, we show OFDM can adaptively compensate for large all-order PMD without requiring feedback. We demonstrate error-free transmission on a 1920km 40xlOGb/s DWDM link with 48ps mean DGD in presence of fiber nonlineariry.
We analyze the applications of centralized resource management for transponder sharing and repeater assignment in wavelength selective switch based wavelength cross-connect nodes. We also propose a novel solution to realize centralized resource management.
We investigate the impact of off-center optical filtering plus electronic equalization for 10-Gb/s directly-modulated systems. Simulation results show the transmission distance over standard single-mode fiber is increased >6-times (from <25-km to >150-km) without optical dispersion compensation.
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