High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality

Harako, Koudai; Otuya, David O.; Kasai, Keisuke; Hirooka, Toshihiko; Nakazawa, Makoto

doi:10.1364/oe.22.029456

Cited by 30 publications

(4 citation statements)

References 8 publications

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“…Optical Nyquist pulses have remarkable properties such as a high bandwidth efficiency and the absence of inter-symbol interference (ISI), which can generate a more densely arranged optical pulse train in the time-domain compared with Gaussian and sech 2 type pulses. The densely arranged pulse train is suitable for high-speed optical time-division multiplexing (OTDM) transmission [1], [3], [5]- [7] and high-rate optical sampling [8].…”

Section: Introductionmentioning

confidence: 99%

Low-Loss Optical Nyquist Pulse Train Generation Using Nonauxiliary Wavelength Selective Switch in Communication Band

et al. 2019

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We report low-loss optical Nyquist pulse train generation using a non-auxiliary wavelength selective switch (WSS). The typical approach for optical Nyquist pulse train generation involves two procedures. The first is conversion from a laser output Gaussian pulse to a Nyquist pulse via spectral filtering with a WSS. The second is multiplexing to generate a Nyquist pulse train with an optical circuit. To generate a high optical signal-tonoise ratio (OSNR) Nyquist pulse train, the first procedure was improved by developing a high-power laser and improving the filtering process by using nonlinear effects in a highly nonlinear fiber. The second procedure also has the potential to further improve the OSNR, because an optical circuit typically causes an optical loss of 9 dB in the case of eightmultiplexing. In this study, we demonstrate optical loss reduction for multiplexing using a nonauxiliary WSS approach without an auxiliary optical circuit. The experimental results show that the optical loss for the Nyquist eight-pulse train is successfully reduced to 2.8 dB.

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Section: Introductionmentioning

confidence: 99%

Low-Loss Optical Nyquist Pulse Train Generation Using Nonauxiliary Wavelength Selective Switch in Communication Band

et al. 2019

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“…Further, optical Nyquist OTDM transmission realizes ultra-high baud rate transmission due to the dense arrangement of the optical Nyquist pulses in the time domain that possess intersymbol interference free (ISI free) property [17,18,19,20,21]. Previously, several reports have demonstrated the generation [17,22,23,24] and detection [25,26] of the optical Nyquist pulse.…”

Section: Introductionmentioning

confidence: 99%

Flexible and lossless baud-rate switching for 4-time slots Nyquist OTDM signals using wavelength selective switch

Takahashi

Yamasaki

Inoue

et al. 2019

IEICE Electron. Express

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We demonstrate a flexible and lossless baud-rate switching process of the Nyquist OTDM signals using a wavelength selective switch (WSS) equipped with 4 output ports for different time slots. We generate the Nyquist OTDM signals with different baud rates without using any static OTDM devices such as an optical circuit. The WSSonly configuration allows a flexible baud rate switching by changing the filter functions applied to the WSS. The proposed system can successfully switch among 40, 80 and 120-Gboud/s signals with a switching duration of 80 ms.

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“…In the sampling stage, the coherent sampler performs optical sampling and coherent detection at the same time, which avoids the need for a separate sampling stage [16]. The local oscillator (LO) used for sampling is a sinc pulse train.…”

mentioning

confidence: 99%

“…According to Refs. [16,17], optical sampling a N-OTDM signal with sinc pulses outperforms sampling using Gaussian pulses.…”

mentioning

confidence: 99%

All-optical OFDM demultiplexing with optical partial Fourier transform and coherent sampling

et al. 2019

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High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality

Cited by 30 publications

References 8 publications

Low-Loss Optical Nyquist Pulse Train Generation Using Nonauxiliary Wavelength Selective Switch in Communication Band

Low-Loss Optical Nyquist Pulse Train Generation Using Nonauxiliary Wavelength Selective Switch in Communication Band

Flexible and lossless baud-rate switching for 4-time slots Nyquist OTDM signals using wavelength selective switch

All-optical OFDM demultiplexing with optical partial Fourier transform and coherent sampling

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