In this paper, a scheme for generating sinc-shaped optical Nyquist pulses based on external modulation is proposed. First, five flat optical frequency comb (OFC) lines are generated by a dual-parallel Mach–Zehnder modulator (DP-MZM) for optical carrier phase cancellation interference. Then, the phase-locked OFC is split into two paths, one of which is transmitted to a single-drive Mach–Zehnder modulator (SD-MZM) for the modulation of the even-order side-band suppression, and the other is used to remodulate the signal in order to obtain equally spaced comb lines. Eventually, equal frequency spaced phase-locked 15-line OFCs are generated and extremely narrow over-zero width Nyquist pulses are realized at 2.5 GHz, 5 GHz, 10 GHz and 20 GHz. The root-mean-square error (RMSE) is calculated for the generated Nyquist pulses which enables the verification of the signal quality.
| [1] |
Mandalawi Y, Singh K, Hosni M Iet al. . High-bandwidth coherent OFDM-Nyquist-TDM transceiver with low-bandwidth electronics. IEEE access. 2023, 11: 58244-58253. J]
|
| [2] |
Bosco G, Carena A, Curri Vet al. . Performance limits of Nyquist-WDM and CO-OFDM in high-speed PM-QPSK systems. IEEE photonics technology letters. 2010, 22(15): 1129-1131. J]
|
| [3] |
Schmogrow R, Bouziane R, Meyer Met al. . Real-time OFDM or Nyquist pulse generation-which performs better with limited resources?. Optics express. 2012, 20(26): B543-B551. J]
|
| [4] |
Yuan J. An improved frequency-quadrupling triangular waveform generation based on external modulation and polarization control. Results in physics. 2021, 22: 103885. J]
|
| [5] |
Shoaie M, Mohajerin-Ariaei A, Vedadi Aet al. . Wideband generation of pulses in dual-pump optical parametric amplifier: theory and experiment. Optics express. 2014, 22(4): 4606-4619. J]
|
| [6] |
Misra A, Preußler S, Zhou Let al. . Nonlinearity and dispersion-less integrated optical time magnifier based on a high-Q SiN microring resonator. Science report. 2019, 9114277. J]
|
| [7] |
Cordette S, Vedadi A, Shoaie M Aet al. . Bandwidth and repetition rate programmable Nyquist sinc-shaped pulse train source based on intensity modulators and four-wave mixing. Optics letters. 2014, 39236668-6671. J]
|
| [8] |
Fallahpour A, Zhou H, Liao Pet al. . Demonstration of tunable optical aggregation of QPSK to 16-QAM over optically generated Nyquist pulse trains using nonlinear wave mixing and a Kerr frequency comb. Journal of lightwave technology. 2020, 38(2): 359-365. J]
|
| [9] |
Liu S, Wu K, Zhou Let al. . Optical frequency comb and Nyquist pulse generation with integrated silicon modulators. IEEE journal of selected topics in quantum electronics. 2020, 26(2): 1-8. J]
|
| [10] |
Liu S, Wu K, Zhou Let al. . Modeling a dual-parallel silicon modulator for sinc-shaped Nyquist pulse generation. IEEE journal of selected topics in quantum electronics. 2021, 27(3): 1-8. J]
|
| [11] |
Wu S, Liu N, Cui Y. Highly flexible optical Nyquist pulses generation based on dual-parallel Mach–Zehnder modulator and intensity modulator. Photonic network communication. 2018, 36(3): 361-368. J]
|
| [12] |
Alishahi F, Fallahpour A, Mohajerin-Ariaei Aet al. . Reconfigurable optical generation of nine Nyquist WDM channels with sinc-shaped temporal pulse trains using a single microresonator-based Kerr frequency comb. Optics Letters. 2019, 44(7): 1852-1855. J]
|
| [13] |
Chen H, Wang J, Lu Het al. . Reconfigurable optical frequency comb and Nyquist pulses generation with tunable sensitivities. IEEE access. 2020, 8: 157211-157217. J]
|
| [14] |
Souvaraj D, Misra A, Das Ret al. . Analysis of non-idealities in the generation of reconfigurable sinc-shaped optical Nyquist pulses. IEEE access. 2021, 9: 76286-76295. J]
|
| [15] |
Liu Y, Wu S. Proposed scheme for ultra-flat optical frequency comb generation based on dual-drive Mach–Zehnder modulators and bidirectional recirculating frequency shifting in single loop. Photonics. 2022, 9(8): 514. J]
|
| [16] |
Ban X, Zhou J, Jiang Jet al. . Flexible tunable Nyquist pulse generation using recirculating frequency shift loop. IEEE photonics journal. 2023, 1531-5. J]
|
| [17] |
Zhang K, Sun W, Chen Yet al. . A power-efficient integrated lithium niobate electro-optic comb generator. Communications physics. 2023, 6117. J]
|
| [18] |
Moille G, Lu X, Stone Jet al. . Fourier synthesis dispersion engineering of photonic crystal microrings for broadband frequency combs. Communications physics. 2023, 61144. J]
|
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