Photonic generation of frequency-quadrupled triangular waveform based on a DP-QPSK modulator with tunable modulation index

Wang, Chuangye; Ning, Tigang; Li, Jing; Pei, Li; Jiao, Z.; Li, Yujian; Xie, Caijian

doi:10.1016/j.optlastec.2020.106818

Cited by 9 publications

(6 citation statements)

References 29 publications

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“…In Ref [6], Wang et al generate a triangular waveform using a dual-polarization quadrature phase-shift-keying (DP-QPSK) modulator. The repetition rate of the triangular waveform is four times the RF signal.…”

Section: Introductionmentioning

confidence: 99%

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Optical Microwave Waveforms Generation Based on the Round-Trip Phase of the DFB Laser

et al. 2023

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In this paper, we theoretically and experimentally analyze the influence of the round-trip phase of distributed feedback (DFB) lasers on the harmonic-phase of photocurrent, caused by the external injection current. The results indicate that the harmonicphase of photocurrent introduced by the round-trip phase (HPIRP) reduces with the increase of modulation depth at a fixed frequency. Then, based on the HPIRP of the DFB laser, a simple photonic generation method of optical microwave waveforms is proposed and verified. In this scheme, three lasers with different wavelengths are mainly used. By adjusting the tunable optical delay lines and attenuators, the amplitude and phase of the photocurrent of the three branches converted by the photodetector (PD) can be controlled individually. The photocurrent of the superposition of the three branches can be controlled properly to form the target waveform. Dispersive elements and complex microwave photonic filtering are not required. Through experiments, rectangular and triangular waveforms with a repetition frequency of 3.75 GHz are generated.

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Section: Introductionmentioning

confidence: 99%

“…External modulators require continuous wave (CW) lasers to generate optical carriers. The DC bias drift of the MZM modulators can result in undesired waveforms [4], [5], [6], [7], [8], [9]. In Ref [4], [5], [9], the schemes are polarization-dependent, which will reduce the stability of the system.…”

Section: Introductionmentioning

confidence: 99%

Optical Microwave Waveforms Generation Based on the Round-Trip Phase of the DFB Laser

et al. 2023

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“…To overcome the above-mentioned problems, another method based on the Fourier series analysis is proposed to generate triangular waveforms with full-duty-cycle and flexible tunability [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29]. In this method, the Fourier series of a periodic triangle wave has only odd-order harmonics and the amplitude of its high-order harmonics have a fast roll-off factor.…”

Section: Introductionmentioning

confidence: 99%

“…Then the SBS-based optical carrier recovery process is introduced to generate a desired triangularshaped microwave waveform. Afterwards, various improved schemes have been proposed and reported successively [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29]. To avoid using external microwave sources, researchers have proposed triangular microwave generation schemes based on a single-loop [23] or a dual-loop [24] optoelectronic oscillator.…”

Section: Introductionmentioning

confidence: 99%

Triangular-Shaped Microwave Waveforms Generation Based on Optical Polarization Processing and Stimulated Brillouin Amplification

et al. 2023

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We propose and experimentally demonstrate an approach to generate triangular-shaped microwave signals based on optical polarization processing and stimulated Brillouin amplification, using a polarization modulator (PolM) and a fiber Brillouin amplifier. The odd-and even-order optical sidebands become polarized in mutually orthogonal directions by external modulating a continuous-wave laser light using the PolM. Then the odd-order optical sidebands are selected by a polarizer while the even-order optical sidebands are suppressed. Moreover, the power ratio of the odd-order optical sidebands is controlled by adjusting the modulation index. To generate triangular waveforms, an optical carrier recovery process is implemented by jointly controlling the direction α of the polarizer transmission axis and the amplification effect from the stimulated Brillouin scattering. After photodetection, Fourier harmonics are produced by beating the amplified optical carrier with the odd-order optical sidebands, which synthesizes triangular-shaped microwave waveforms. The effect of α on the generated waveform is analyzed theoretically and demonstrated experimentally. In the proof-of-concept experiment, triangular-shaped microwave signals with small root-mean-square error at repetition frequencies of 10, 11, and 12 GHz are successfully generated, demonstrating flexible tunability and excellent waveforms.

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“…Generation of the triangular waveform is the motivation of study due to its wide applications, and because it has a ris-ing and falling linear edge in optical intensity, it has many advantages over any other waveform [5], such as optical signal conversion, optical frequency conversion, pulse compression, signal copying, and doubling of the optical signal [6].…”

Section: Introductionmentioning

confidence: 99%

Generation of triangular waveform radiofrequency signals based on photonic filtering using a broad-spectrum source

Muraoka¹,

Arvizu

Sanchez-Lopez³

et al. 2022

Rev. Mex. Fís.

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This work proposes a photonic method to generate optical pulses with a triangular wave shape using a low coherence source. We modulate this source using a sinusoidal radio frequency signal as a local oscillator. We eliminate the second harmonic of the spectral components generated by the modulation process tuning a reject filter to get a triangular wave. We implement the filter using an interferometer with a delay line in one of their branches. To tune the filter, the only adjustment required is over the optical delay line. We developed our scheme in a simulation environment but based on the use of optical and optoelectronic elements with parameters of commercial devices, some of them available in our laboratory. We generate triangular waveform signals with pulse frequencies of 100, 150, 250, and 300 MHz as proof of concept. The proposed scheme has the advantage of being low cost and easy to use because it does not require bias control nor adjustment to Vpi voltage. Usually, other authors must vary these parameters to get the desired electrical signal. Still, we generate the triangular waveform by adjusting only the local oscillator frequency and the optical delay line. Therefore, because we use a broad-spectrum optical source and do not require a strictly controlled variable voltage, our system will be cheaper.

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Photonic generation of frequency-quadrupled triangular waveform based on a DP-QPSK modulator with tunable modulation index

Cited by 9 publications

References 29 publications

Optical Microwave Waveforms Generation Based on the Round-Trip Phase of the DFB Laser

Optical Microwave Waveforms Generation Based on the Round-Trip Phase of the DFB Laser

Triangular-Shaped Microwave Waveforms Generation Based on Optical Polarization Processing and Stimulated Brillouin Amplification

Generation of triangular waveform radiofrequency signals based on photonic filtering using a broad-spectrum source

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