640 Gbaud (128 Tbit/s/ch) optical Nyquist pulse transmission over 525 km with substantial PMD tolerance

Abstract

We report a substantial increase in PMD tolerance in a single-channel ultrahigh-speed transmission using optical Nyquist pulses. We demonstrate both analytically and experimentally a large reduction in depolarization-induced crosstalk with optical Nyquist pulses, which is one of the major obstacles facing polarization-multiplexed ultrashort pulse transmission. By taking advantage of the high PMD tolerance, a low-penalty 1.28 Tbit/s/ch optical Nyquist TDM transmission at 640 Gbaud was achieved over 525 km.

All-optical Nyquist Filtering for elastic OTDM signals and their spectral defragmentation through parametric processes

“…Being compared to conventional OTDM systems, long distance transmission of Nyquist OTDM is possible thanks to the improved dispersion and polarization mode dispersion (PMD) tolerances due to the significant reduction of the signal bandwidth through the optical Nyquist filtering [12,13]. Highly accurate dispersion compensation is necessary to maintain the orthogonality of the Nyquist pulses in time domain at the receiver.…”

“…Since the raised cosine waveform causes interference between neighboring tributaries, CR for Nyquist OTDM is hardly possible even by the state-of-the-art ultrafast CR techniques. This issue, however, has not been addressed in the transmission demonstrations [5,6,12,13]. We have carried out a stable CR scheme for Nyquist OTDMs with baudrate up to 344 Gbaud [9] by using the optical null-header insertion [14].…”

Demutiplexing of Nyquist-OTDM Signal Based on Temporal Magnification Aided Optical Sampling With Enhanced Performance

“…High spectral single-channel transmission has become the target of intensive research as required by the growing demand for network resource. Nyquist optical time-division multiplexing (N-OTDM) [1] has been a research interest due to its capability to achieve fundamental minimum bandwidth, as well as its tolerance to transmission impairments such as chromatic dispersion [2], polarization mode dispersion [3], and self-phase modulation [4]. Combined with other multiplexing techniques, it has been proved to achieve an ultra large transmission capacity of 43 Tbit/s [5].…”

Optical NRZ-to-RZ format conversion based on frequency chirp linearization and spectrum slicing

“…The conventional NRZ-to-RZ format conversion schemes cannot generate the Nyquist-shaped RZ signal. Several approaches have been demonstrated for optical Nyquist pulse generation, such as electrical Nyquist filtering [6], temporal optical pulse-shaping [7] and cascaded Mach À Zehnder modulators (MZMs) [8]. However, these existing Nyquist pulse generation methods cannot be simply adapted for the NRZ-to-RZ format conversion.…”