RF Up-Conversion and Waveform Generation Using a Frequency-Shifting Amplifying Fiber Loop, Application to Doppler Velocimetry

Yang, Hongzhi; Brunel, Marc; Zhang, Haiyang; Vallet, Marc; Zhao, Changming; Yang, Suhui

doi:10.1109/jphot.2017.2775617

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…The proof-of-concept demonstrated here could be extended to integrated photonics since optical rings, filters, and EOMs can be integrated on photonic platforms. This EOM-based FS loop could address applications already envisioned with FS loops, like high-repetition rate pulse trains [11], RF waveform generation [13,25] and processing [14], or ranging [18,26,27]. Besides, such a scheme may be considered when designing pump-probe experiments, since the delay can be voltage-controlled without using moving delay lines.…”

Section: Resultsmentioning

confidence: 99%

“…The carrier will also circulate together with the multiple frequency-shifted sidebands. This raises questions about the ability to generate a pulse train from a continuous-wave seed, the so-called continuous-to-pulse conversion regime [11,12], or to generate arbitrary waveforms [16,18]. Furthermore, an analytical model has to be derived in order to take into account the specific transfer function of the EOM.…”

Section: Introductionmentioning

confidence: 99%

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Pulse doublets generated by a frequency-shifting loop containing an electro-optic amplitude modulator

Yang¹,

Vallet²,

Zhang³

et al. 2019

Opt. Express

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We investigate theoretically and experimentally an all-fibered frequency-shifting loop which includes an electro-optic amplitude modulator (EOM) and an optical amplifier, and is seeded by a continuous-wave laser. At variance with frequency-shifted feedback lasers, or Talbot lasers, that contain an acousto-optic frequency shifter, the EOM creates at each round-trip two side-bands that recirculate inside the loop. Benefiting from the high modulation frequency of the EOM, a wide optical frequency comb up to 40 GHz is generated. We demonstrate an original double-pulse regime when the loop length is a multiple of the RF modulation wavelength applied to the modulator. The inter-pulse interval is governed by both the bias voltage and modulation depth of the EOM. Besides, some typical waveforms such as saw-tooth and rectangle are experimentally obtained by properly setting operating frequency, bias voltage and the RF power. The system is modeled by a linear interference model that takes the amplitude modulation function and loop delay into account. The model explains the formation of pulse doublets and reproduces well all the experimental waveforms. Furthermore, the un-seeded loop driven above threshold also generates mode-locked picosecond pulse doublets with a continuously adjustable delay up to the modulation period.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pulse doublets generated by a frequency-shifting loop containing an electro-optic amplitude modulator

Yang¹,

Vallet²,

Zhang³

et al. 2019

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…- (5) where ̅ = is a constant complex parameter containing the loop optical phase as well as the gain and loss parameters. In the following we focus our discussion on the loop function L(t) defined by…”

Section: Generalmentioning

confidence: 99%

“…Frequency-shifted feedback loops (FSL) have attracted much attention recently because their peculiar time-frequency properties could lead to numerous applications, such as ultra-high repetition rate pulse generation [1], frequency-to-time mapping [2], optical signal processing [3], arbitrary waveform generation [4,5], heterodyne spectroscopy [6], and ranging [7,8,9]. Inspired from frequency-shifted feedback (FSF) lasers [10,11], a frequency-shifting loop is a sub-threshold ring resonator.…”

Section: Introductionmentioning

confidence: 99%

Analysis of frequency-shifting loops in integer and fractional Talbot conditions: electro-optic versus acousto-optic modulation

et al. 2020

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Frequency-shifting loops (FSL) are analyzed theoretically in cases where the intracavity modulator induces two side-bands at each round-trip, a situation that can be commonly obtained with electro-optic intensity or phase modulators. Using a simple model, we discuss the ability of such loops to perform frequency-to-time mapping, in the integer Talbot condition, or pulse repetition rate enhancement, in the fractional Talbot condition. The results are compared to the established acousto-optic FSL with pure frequency shift. We show that, in spite of a more complicated situation resulting from the dual sideband modulation, pulse repetition rate amplification can be obtained with an amplitude modulator, and frequency-to-time mapping can be obtained with a phase modulator. This opens new routes to high-frequency manipulation of microwave-optical signals with high-bandwidth (multi-GHz) modulators.

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“…If the beat frequency can be tuned according to a target's speed, one can get the proper Doppler frequency shift which is more convenient for signal processing. If the beat frequency reaches several GHz or higher, the moving speed of m/s or even mm/s can be measured easier [7,8]. As well as in terms of distance measurement, with an ability to change the wavelength of the beat signal and realize high-resolution detection of targets at different distances [9,10].…”

Section: Introductionmentioning

confidence: 99%

Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser

et al. 2019

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This study presents a dual-frequency microchip laser with a thermo-optically and electro-optically tuned frequency difference. The dual-frequency microchip cavity is formed by bonding a Lithium tantalite (LiTaO3, LTO) crystal chip and a neodymium-doped yttrium aluminum garnet (Nd:YAG) crystal chip. A single longitudinal mode is generated by the Nd:YAG crystal and split into two frequencies with perpendicular polarizations due to birefringent effect in the LTO chip. Furthermore, continuous beat frequency tuning at different scales is realized by adjusting the temperature and voltage applied to the LTO crystal. A maximum beat frequency of up to 27 GHz is obtained, and the frequency difference lock-in phenomenon is observed below the frequency difference of 405 MHz.

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RF Up-Conversion and Waveform Generation Using a Frequency-Shifting Amplifying Fiber Loop, Application to Doppler Velocimetry

Cited by 7 publications

References 21 publications

Pulse doublets generated by a frequency-shifting loop containing an electro-optic amplitude modulator

Pulse doublets generated by a frequency-shifting loop containing an electro-optic amplitude modulator

Analysis of frequency-shifting loops in integer and fractional Talbot conditions: electro-optic versus acousto-optic modulation

Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser

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