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Photonic circuits are the key to advanced functionality in future optical systems, as they efficiently process terabit/s data streams. This paper reviews how photonic circuit topologies have evolved to support high-spectral efficiency modulation formats, including: all-optical optical frequency division multiplexing (AO-OFDM), discrete Fourier transform spread OFDM (DFT-S-OFDM), Nyquist wavelength...
We propose pairwise coding to enhance a superchannel's tolerance to non-idea ROADM filtering effect. Experimental results show that the number of ROADMs can be double in links with 4% guard-band superchannels.
We experimentally demonstrate optical generation of a super-channel of 7 × 12.5 Gbaud QPSK-modulated subcarriers at Nyquist spacing, using a flat-top interleaver. The interleaver comprises a two-ring-resonator-assisted Mach-Zehnder interferometer with only an 8% excess bandwidth at 25-dB stopband suppression.
We experimentally compare Nyquist-WDM and continuous DFT-S-OFDM systems with 16×64-Gb/s PDM-16QAM signals over 800-km SSMF. The DSP implementations of both systems with fractional oversampling rate are investigated, experimental results show that Nyquist-WDM system performs better with the same processing complexity.
We experimentally demonstrate 16.77-Tb/s multichannel Nyquist WDM using multiple subchannels per modulator to allow optimization of baud rate and nonlinear performance. After 400-km transmission, the 257×65.3-Gb/s bands had an average BER of 2.3×10−3.
Implicit training for channel estimation in long-haul single-carrier polarization-multiplexed coherent optical systems has been experimentally demonstrated. Improved performance can be achieved by applying iterative channel estimation for up to 1900-km QPSK and 1000-km 16-QAM transmissions.
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