Ultrafast Nyquist OTDM demultiplexing using optical Nyquist pulse sampling in an all-optical nonlinear switch

Hirooka, Toshihiko; Seya, Daiki; Harako, Koudai; Suzuki, Daiki; Nakazawa, Makoto

doi:10.1364/oe.23.020858

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…But this still needs an MLL along with optical filters. Furthermore, the optical filters are not rectangular and a nonlinear element is needed to realize the multiplication between the optical signal and the pulses [15]. A much easier way to generate high-quality sinc-pulse sequences is using one or two Mach-Zehnder Modulators (MZMs) [16]- [18].…”

Section: Sampling Conceptmentioning

confidence: 99%

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics

et al. 2022

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The growing demand for bandwidth and energy efficiency requires new solutions for signal detection and processing. We demonstrate a concept for high-bandwidth signal detection with low-speed photodetectors and electronics. The method is based on the parallel optical sampling of a highbandwidth signal with sinc-pulse sequences provided by a Mach-Zehnder modulator. For the electronic detection and processing this parallel sampling enables to divide the high-bandwidth optical signal with the bandwidth B into N electrical signals with the baseband bandwidth of B/(2N ). In proof-of-concept experiments with N = 3, we present the detection of 24 GHz optical signals by detectors with a bandwidth of only 4 GHz. For ideal components, the sampling and bandwidth down-conversion does not add an excess error to the signals and even for the nonideal components of our proof-of-concept setup, it is below 1 %. Thus, the rms error for the measurement of the 24 GHz signal was reduced by a factor of about 3.4 and the effective number of bits were increased by 1.8.

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Section: Sampling Conceptmentioning

confidence: 99%

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics

et al. 2022

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“…Besides communications, the temporal and spectral features of the pulse sequences like multi-wavelength operation and tunable repetition rate make them suitable to be used as a sampling source in photonic analog-to-digital (ADC) and digital-to-analog conversion (DAC) [16] - [18], [21] - [23] and as sampling pulses for the demultiplexing of Nyquist optical time-division multiplexing (OTDM) signals [24].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Non-Idealities in the Generation of Reconfigurable Sinc-Shaped Optical Nyquist Pulses

Misra

Das

et al. 2021

IEEE Access

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Optical sinc-shaped Nyquist pulses are widely used in microwave photonics, optical signal processing, and optical telecommunications due to their numerous advantages, like rectangular shape in the frequency domain, the orthogonality and the consequential possibility to use these pulses to transmit data with the maximum possible symbol rate. Ideal sinc pulses with the rectangular spectrum are just a mathematical construct. However, high-quality sinc pulse sequences offer the same advantages and can be generated by a phase-locked rectangular frequency comb with mode-locked lasers, intensity modulators, and integrated devices. Nevertheless, any non-idealities in the pulse and comb generation might lead to a degradation of the system performance, especially for metrology. Here, we investigate and analyze the effect of three major non-idealities, namely, the roll-off factor, the side band suppression ratio (SSR), and the ripple of sinc-shaped reconfigurable optical Nyquist pulse sequences based on 3, 5, and 9-line optical phase-locked frequency combs. We compare these results with the existing literature for the three-line comb followed by the experimental verification of the simulation results. We illustrate that by increasing the number of comb lines, the pulse sequences have superior performance and contribute to lesser root-mean-square (r.m.s.) error. We also discuss the trade-off between the r.m.s. error and the optical power loss for increasing the SSR.INDEX TERMS Nyquist pulse, optical frequency combs, ripple, side band suppression, optical sampling.

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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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Ultrafast Nyquist OTDM demultiplexing using optical Nyquist pulse sampling in an all-optical nonlinear switch

Cited by 16 publications

References 7 publications

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics

High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics

Analysis of Non-Idealities in the Generation of Reconfigurable Sinc-Shaped Optical Nyquist Pulses

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

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