Flat optical frequency comb generation based on polarization modulator with RF frequency multiplication circuit and dual-parallel Mach-Zehnder modulator

Lv, Xiuping; Liu, Jia; Wu, Shibao

doi:10.1016/j.ijleo.2019.02.114

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…Another interesting frequency combs called microcomb soliton microcombs have diverse applications in the imaging, and in low noise microwave generations [18], [19]. The OFC can be generated by various techniques, including single or cascaded configurations of optical modulators [20]- [23], radio frequency shifting loops (RFS) [24], [25], mode-locked lasers [26]- [28], and self-oscillation loops [27], [29]- [36]. The RFS loops and mode-locked lasers also produce efficient results, but the system complexity is greatly increased.…”

Section: Introductionmentioning

confidence: 99%

1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver

Ullah,

Chen

et al. 2024

IEEE Photonics J.

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A new optoelectronic oscillator (OEO) is implemented for a novel self-sustained flat-topped selfoscillating optical frequency comb generator (SO-OFCG), which can be deployed in terahertz optical transmission. The OFCG is designed from a cascaded configuration of an electro-absorption modulator and a polarization controller. In this work, the radio frequency source of a traditional-OFC scheme is replaced by the OEO. The frequency spacing of the generated spectrum is defined by the OEO~20GHz that contains 15-healthy frequency tones. The carriers are modulated using the 16-quadrature amplitude modulation technique and transmitted across an SSMF implemented in a loop to complete a fiber span of 80km-240km. Overall, 1.12Tbps transmission can be achieved with the help of the given setup. At the receiver side, a homodyne coherent receiver is designed using the proposed OFCG to receive the signal. The conventional local oscillator lasers are replaced by the SO-OFCG generated from the received central optical carrier. Through offline DSP, the received optical signals are remunerated from various signal distortions and nonlinear impairments by utilizing digital backpropagation, constant modulus algorithm, and blind phase search algorithm at the receiving end. The system is analyzed regarding the bit error rate, symbol error rate, Q-factor, and error vector magnitude.

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Section: Introductionmentioning

confidence: 99%

1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver

Ullah,

Chen

et al. 2024

IEEE Photonics J.

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“…[12]. Periodic optical ultra-short pulse generation using mode-locked laser (MLL) [13][14], electro-optic modulators [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], Kerr nonlinearity [35][36] and micro-resonators [37][38] are some effective techniques to generate OFC. MLL sources generate periodic pulse train of femto-second pulse width by controlling the cavity parameters [13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The cavity dependency over environmental conditions makes the system unstable. The compression of optical signals can generate the tunable and stable OFC by controlling the RF signal parameters applied to the multiple parallelly or serially connected electro-optic modulators [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Chen et al [16] proposed a single polarization modulation based seven-line OFC and achieve the flatness of 1.47 dB.…”

Section: Introductionmentioning

confidence: 99%

Cross-phase modulation based ultra-flat 90-line optical frequency comb generation

2021

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This paper proposed an approach to design an evenly spaced, 1.8 THz spectrally broad and 1.6 dB flat optical frequency comb (OFC) by exploiting the cross-phase modulation in highly nonlinear fiber. The OFC is realized by controlling the phase of the signals in two parallelly placed highly nonlinear fibers. The frequency and line spacing of the OFC can be tuned by simply varying the periodicity and central wavelength of input electrical and optical signal, respectively.

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“…Generation of OFC using optical modulation is another interesting technique and has already been widely studied. This technique can be explained in two parts: (i) the first one is based on the utilization of either intensity modulators (IMs) [19], [20], cascaded or parallel IMs [1], [21]- [23], phase modulators (PMs) [24]- [26], or polarization modulators [27]. (ii) the second one is based on the hybrid utilization of different modulators such as cascaded configuration of PM and IMs [28].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth

Ullah

Zhang

et al. 2020

IEEE Access

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In this paper, a new technique for generation of ultra-wide and flattened optical frequency comb (OFC) based on serial cascading of a phase modulator and dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO 3-MZM) is proposed. Over 60 carriers were generated by carefully adjusting the RF switching voltage (RFSV) of the DD-LiNbO 3-MZM and the signal frequency of the sinusoidal wave (RF) source. A low power amplified RF source with a signal driving power of 16.9dBm is applied, and the power of CW laser is kept at 3dBm. The frequency spacing (FS) is kept at 20GHz for generating the maximum number of carriers. Nonetheless, the scheme is also tested for the FSs of 64GHz, and 32GHz. Each scenario is examined in simulation environment and the main outcomes are highlighted. The proposed scheme is comparatively simple and the FS varies with the applied RF source on the modulators. The achieved OFC lines have a tone-to-noise ratio (TNR) of over 45dB with an undesired side mode suppression ratio of approximately 20dB. The comb lines are almost flat with a varying power deviation of around 0dB-6dB which is optimized to nearly 0.12dB. Furthermore, the impact of the RFSV on the generated number of carriers is studied in detail. The scheme is analyzed in terms of cost efficiency, power deviations, TNR, optical signal to noise ratio, and number of achieved comb lines.

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Flat optical frequency comb generation based on polarization modulator with RF frequency multiplication circuit and dual-parallel Mach-Zehnder modulator

Cited by 8 publications

References 8 publications

1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver

1.12Tbps-16QAM Uncompensated Long-Haul Transmission Employing a New Self-Oscillating Optical Frequency Comb Generator Both at Transmitter and Receiver

Cross-phase modulation based ultra-flat 90-line optical frequency comb generation

Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth

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