Adjustable repetition-rate multiplication of optical pulses using fractional temporal Talbot effect with preceded binary intensity modulation

Xie, Qijie; Zheng, Bin; Shu, Chester

doi:10.1016/j.optcom.2017.01.002

Cited by 16 publications

(4 citation statements)

References 13 publications

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“…1(b)). This comb heterodyne scheme is equivalent to a dual comb spectroscopy detection setup in the particular case where the FSR of one of the mixing OFC signals is an integer multiple of the other OFC [5], [36], [37]. To implement the heterodyning process, we used a 50:50 fiber coupler to divide the laser output into two identical branches.…”

Section: Optical Heterodyne Detection For Comb Characterizationmentioning

confidence: 99%

Ultra-Dense CEO-Stabilized Broadband Optical Frequency Comb Generation Through Simple, Programmable, and Lossless 1000-Fold Frequency-Spacing Division

Seghilani

Maram

et al. 2019

IEEE Photonics J.

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Ultra-dense broadband optical frequency combs with sub-MHz frequency spacing and stabilized carrier-envelope offset (CEO) are needed for many important applications, including high-accuracy real-time sub-Doppler spectroscopy, precise characterization of photonic devices, and greenhouse gas sounding. However, the generation of such combs remains very challenging because they require mode-locked lasers with impractically long cavities (>few hundred meters). Here we demonstrate a CEO-stabilized optical frequency comb with a programmable sub-MHz frequency spacing, obtained through simple, suitable temporal phase modulation of a 250-MHz input comb. The method preserves the energy, the bandwidth, and the CEO-stabilization of the input comb, achieving a combined (CEO and repetition-rate) integrated phase noise below π/10, and a frequency spacing down to 250 kHz over a 5-dB bandwidth of 10 THz, i.e., corresponding to a record high 1000-fold frequency spacing reduction and more than 40 000 000 comb lines. The demonstrated method bridges the gap between presently available high-quality optical frequency combs and a host of demanding and important applications that require CEO-stabilized broadband frequency combs with sub-MHz spacings.

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Section: Optical Heterodyne Detection For Comb Characterizationmentioning

confidence: 99%

Ultra-Dense CEO-Stabilized Broadband Optical Frequency Comb Generation Through Simple, Programmable, and Lossless 1000-Fold Frequency-Spacing Division

Seghilani

Maram

et al. 2019

IEEE Photonics J.

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show abstract

“…It occurs when a pulsed light source, such as a pulsed laser, is sent through a first order dispersive medium. The replicated pulses, known as the temporal Talbot time, are observed at regular intervals, which are shorter than the period of the input signal [5][6][7][8][9][10] , and can even convert continuous wave (CW) signals into pulses by propagating the input signal through a first-order dispersive medium 11 . The temporal Talbot effect has found numerous applications in signal processing, including pulse rate multiplication 9,[12][13][14] , pulse generation 11,15 , passive amplification 16,17 , signal denoising 18 , sub-noise detection 19 , pulse compression 20 , and temporal cloaking 21,22 .…”

Section: Introductionmentioning

confidence: 99%

Passive amplification of microwave pulses via temporal Talbot effect: Experimental demonstration and potential applications

Pepino

Mota

Borges

2023

Preprint

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The temporal Talbot effect is a phenomenon that modulates the output pulse repetition rate based on the input period. As previously demonstrated, this effect enables innovative applications such as passive amplification. However, its observation in the microwave regime has been impractical due to the requirement for controlled propagation through a highly dispersive waveguide. To overcome this challenge, we employed an ultra-wide band linearly chirped Bragg grating within a standard microwave X-Band waveguide. By utilizing backwards Talbot array illuminators aided by particle swarm optimization, we achieved passive amplification with a gain of 3.45 dB and 4.03 dB for gaussian and raised cosine pulses, respectively. Furthermore, we demonstrated that with higher quality substrates this gain can be theoretically increased to over 8 dB. Our work paves the way for numerous applications of the Talbot effect in the microwave regime, such as temporal cloaking, secure communications, stealth technology, microwave pulse shaping, and microwave frequency combs.

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“…It occurs when a pulsed light source, such as a pulsed laser, is sent through a first order dispersive medium. The replicated pulses, known as the Talbot fractional images, are observed at regular intervals, which are shorter than the period of the input signal 5 – 10 , and can even convert continuous wave (CW) signals into pulses by propagating the input signal through a first-order dispersive medium 11 . The temporal Talbot effect has found numerous applications in signal processing, including pulse rate multiplication 9 , 12 – 14 , pulse generation 11 , 15 , passive amplification 16 , 17 , signal denoising 18 , sub-noise detection 19 , pulse compression 20 , and temporal cloaking 21 , 22 .…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of passive microwave pulse amplification via temporal Talbot effect

Pepino,

da Mota,

Borges

2023

Sci Rep

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The temporal Talbot effect is a passive phenomenon that occurs when a periodic signal propagates through a dispersive medium with a quadratic phase response that modulates the output pulse repetition rate based on the input period. As previously proposed, this effect enables innovative applications such as passive amplification. However, its observation in the microwave regime has been impractical due to the requirement for controlled propagation through a highly dispersive waveguide. To overcome this challenge, we employed an ultra-wide band linearly chirped Bragg grating within a standard microwave X-Band waveguide. By utilizing backwards Talbot array illuminators aided by particle swarm optimization, we achieved passive amplification with a gain of 3.45 dB and 4.03 dB for gaussian and raised cosine pulses, respectively. Furthermore, we numerically verified that with higher quality substrates this gain can be theoretically increased to over 8 dB. Our work paves the way for numerous applications of the Talbot effect in the microwave regime, such as temporal cloaking, sub-noise microwave signal detection, microwave pulse shaping, and microwave noise reduction.

show abstract

Adjustable repetition-rate multiplication of optical pulses using fractional temporal Talbot effect with preceded binary intensity modulation

Cited by 16 publications

References 13 publications

Ultra-Dense CEO-Stabilized Broadband Optical Frequency Comb Generation Through Simple, Programmable, and Lossless 1000-Fold Frequency-Spacing Division

Ultra-Dense CEO-Stabilized Broadband Optical Frequency Comb Generation Through Simple, Programmable, and Lossless 1000-Fold Frequency-Spacing Division

Passive amplification of microwave pulses via temporal Talbot effect: Experimental demonstration and potential applications

Experimental demonstration of passive microwave pulse amplification via temporal Talbot effect

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