Active mode-locking optoelectronic oscillator

Yang, Bo; Zhao, Hongyan; Cao, Zizheng; Yang, Shuna; Zhai, Yanrong; Ou, Jun; Chi, Hao

doi:10.1364/oe.406017

Cited by 65 publications

(9 citation statements)

References 26 publications

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“…In some studies, frequency scanning laser source or baseband frequency chirp electrical signal is introduced into the OEO loop, when the frequency scanning period meets the Fourier domain mode locking conditions, the linear frequency chirped signal will oscillate in the OEO loop [9][10][11]. Recently, time domain mode locking in the OEO loop has been proposed to generate microwave pulse signal, which is widely used in the pulse Doppler radar and warning radar [12][13]. In this structure, an additional amplitude modulator is added to the OEO loop to achieve the active mode locking, when the frequency of the injected signal is equal to the mode space of the OEO loop, the time domain mode locking is achieved and the microwave pulse will be generated [14].…”

Section: Introductionmentioning

confidence: 99%

Tunable Microwave Pulse Generation Based on a Time-Domain Mode Locked Optoelectronic Oscillator

et al. 2022

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A tunable microwave pulse generator is proposed and demonstrated. In this study, a time-domain mode locked optoelectronic oscillator (OEO) is realized by utilizing a dual-parallel Mach-Zehnder modulator (DPMZM). One branch of the DPMZM is modulated by the feedback signal and another branch is modulated by an inject signal. When the frequency of the injected signal is equal to an integer multiple of the oscillation mode space, the time-domain mode locking is achieved in the OEO loop and the microwave pulse trains are generated. In the experiment, the phase noise of the generated signal is -93 dBc/Hz, the frequency range of the generated signal is 6 -12 GHz, the time duration of the generated microwave pulse can be adjusted from 620 ns to 2970 ns, and the repetition rate of the generated microwave pulse can be set to 185.1 kHz, 370.2 kHz and 555.3 kHz.

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Section: Introductionmentioning

confidence: 99%

Tunable Microwave Pulse Generation Based on a Time-Domain Mode Locked Optoelectronic Oscillator

et al. 2022

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“…Based on the principle of parity-time symmetry, single-mode oscillation of OEO can be realized without the use of ultra-narrow filters [8,9] . Furthermore, the introduction of time-domain mode-locking technology into OEO [10][11][12][13][14][15] can eliminate the constraint of the intracavity mode competition effect and achieve phase locking of the longitudinal modes in the cavity, which provides a new approach to generate microwave pulse signals. Since the microwave pulse signal has the advantages of power balance, good stability, and low phase noise, it is considered to have great potential for applications in the fields such as frequency modulation radar, electronic testing systems, and multi-carrier communication systems.…”

Section: Introductionmentioning

confidence: 99%

“…Levy [10] et al inserted a saturated RF amplifier equivalent to a saturable absorber into the OEO cavity and realized OEO based on a passive mode-locking mechanism for the first time. In 2020, Bo Yang et al [12] introduced the active modelocking technology to OEO by attaching an electro-optical intensity modulator as a loss-modulated mode-locking device within the OEO loop. In 2021, Zhen Zeng et al [13] proposed a microwave pulse signal generation scheme based on the actively mode-locked OEO, using the electric amplitude modulator (AM) to periodically modulate the loss in the ring cavity.…”

Section: Introductionmentioning

confidence: 99%

Rational harmonic mode-locked optoelectronic oscillator

Tuo

Zhao

Meng

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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Rational harmonic mode-locking refers to a mode-locking state achieved at the modulation frequency that doesn’t match the fundamental frequency. In this paper, we investigated and experimentally achieved rational harmonic mode-locking in optoelectronic oscillators (OEO) for the first time through three schemes based on electric amplitude modulator (AM), electric phase modulator (PM), and Mach-Zehnder modulator (MZM), respectively. In the experiment, the fundamental frequency mode-locking as well as the 2nd-order, 3rd-order, and 4th-order rational harmonic mode-locking were obtained, all generating ultrashort microwave pulses with a repetition rate of 95 kHz and a carrier frequency of 10 GHz. Subsequently, the characteristics of the pulse signals generated by different schemes, such as pulse width, pulse amplitude, and spectral width, were systematically investigated. By comparison, we found that the AM-based mode-locked OEO generates microwave pulse signals with higher stability and narrower pulse width; the PM-based mode-locked OEO can excite more longitudinal modes in the cavity but generates signals with more spurious noise; the MZM-based mode-locked OEO has a simple structure and requires lower power of the modulation signal. We believe this paper could provide some reference for the research on the physical mechanism of the mode-locking phenomenon generated in the OEO when the modulation frequency is mismatched.

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“…The FDML is a supplement to the standard mode-locking [11]. Applying the two different mode-locking techniques to an OEO, a standard mode-locked OEO [21] and an FDML OEO can be obtained, respectively. Fig.…”

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confidence: 99%

Optoelectronic Oscillator for Arbitrary Microwave Waveform Generation

Chen

Zuo

Shi

2021

J. Lightwave Technol.

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An optoelectronic oscillator (OEO) for arbitrary microwave waveform generation based on Fourier domain mode-locking (FDML) is proposed. A reconfigurable optical waveform generator (OWG) is implemented via external electro-optical modulation, which serves as the optical source for the OEO. The optical waveform from the OWG can be seen as a series of frequency-scanning optical wavelengths in the frequency domain, and at any instant, the number of wavelengths can be from 0 to infinite. By setting the period of the optical waveform or its multiple equal to the cavity round-trip time, an FDML OEO implemented by a frequency-scanning microwave photonic filter is realized based on the phase-modulation-to-intensity-modulation conversion using a phase modulator cascaded with a phase-shifted fiber Bragg grating with its scanning characteristics according to the optical waveform, which can be utilized to generate low phase noise arbitrary microwave waveform using the inherent low phase noise merit of an OEO. A proof-of-concept experiment is performed. Linearly-chirped microwave waveforms and non-linearly-chirped microwave waveforms with a scanning bandwidth of 600 MHz, 2-level frequency hopping (FH) microwave waveform with an FH range of 400 MHz, and 218-bit binary and quaternary phase-coded microwave waveforms are generated from the OEO. To the best of our knowledge, this is the first time that an OEO is proposed for arbitrary microwave waveform generation.

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Active mode-locking optoelectronic oscillator

Cited by 65 publications

References 26 publications

Tunable Microwave Pulse Generation Based on a Time-Domain Mode Locked Optoelectronic Oscillator

Tunable Microwave Pulse Generation Based on a Time-Domain Mode Locked Optoelectronic Oscillator

Rational harmonic mode-locked optoelectronic oscillator

Optoelectronic Oscillator for Arbitrary Microwave Waveform Generation

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