Photonic Generation of Rectangular and Triangular Microwave Waveforms With Tunable Duty Cycle

Chen, Xiaoyu; Li, Guangyi; Shi, Difei; Wang, Lu; Du, Jinfeng; Li, Ming; Zhu, Ning; Li, Wei

doi:10.1109/lpt.2022.3159555

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…Many techniques have been proposed for generating high-speed triangular waveforms, such as frequency-time mapping (FTTM), 10 – 12 Fourier synthesis, 13 – 15 and optical external modulation 16 – 18 Both FTTM technology and Fourier synthesis methods require high-accuracy pulse spectrum processors, to process optical signals customized by harmonics of spectral combs or spectral envelops, adding to the complexity and costliness of the system. In contrast, optical external modulation avoids pulse spectrum processing.…”

Section: Introductionmentioning

confidence: 99%

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Photonic generation of high-accuracy triangular waveform with tunable duty cycle based on a dual-wavelength I/Q modulation

Yan,

Li,

Zhao

et al. 2024

Opt. Eng.

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The photonic generation of high-accuracy triangular waveforms with a tunable duty cycle based on a dual-wavelength in-phase/quadrature-phase (I/Q) modulation is proposed and analyzed. By adjusting the modulation index, the phase shift caused by the electric phase shifter and the bias voltage of the modulator, the optical signals of the upper and lower paths can be superimposed and then passed through the bandwidth limited photodetector to obtain a triangular wave, form with a tunable duty cycle ranging from 0.1 ≤ σ ≤ 0.9. High-order harmonic Fourier series components are used to construct the high-accuracy function waveform. It is found that the waveform rms error can be greatly decreased (around two-time performance improvement with duty cycle 0.1 ≤ σ ≤ 0.9). To evaluate the feasibility of our proposal, the effects of modulation index drift, bias voltage drift, and phase shift drift on the obtained waveform are also discussed.

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Section: Introductionmentioning

confidence: 99%

“…In Ref. 18, a microwave photonic scheme generates rectangular and triangular waveforms by external modulation. The main structure is based on a Mach–Zehnder modulator and a tunable optical delay line.…”

Section: Introductionmentioning

confidence: 99%

Photonic generation of high-accuracy triangular waveform with tunable duty cycle based on a dual-wavelength I/Q modulation

Yan,

Li,

Zhao

et al. 2024

Opt. Eng.

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show abstract

“…However, a 90°mixing coupler is used for phase modulation to generate a triangular waveform, which reduces the flexibility of the system. In Ref [8], a photonic generation scheme of square and triangular waveforms with tunable duty cycles is proposed based a single MZM. By adjusting the magnitude of the second harmonic amplitude, the duty cycles of the triangle and square microwave waveforms are controlled.…”

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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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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“…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%

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

et al. 2023

Self Cite

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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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Photonic Generation of Rectangular and Triangular Microwave Waveforms With Tunable Duty Cycle

Cited by 7 publications

References 14 publications

Photonic generation of high-accuracy triangular waveform with tunable duty cycle based on a dual-wavelength I/Q modulation

Photonic generation of high-accuracy triangular waveform with tunable duty cycle based on a dual-wavelength I/Q modulation

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

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