Programmable microwave photonic phase filters with large time-bandwidth product based on ultra-broadband optical frequency comb generation

Song, Minhyup; Wu, Rui; Torres-Company, Víctor; Weiner, Andrew M.

doi:10.1109/mwp.2012.6474059

Cited by 3 publications

(5 citation statements)

References 17 publications

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“…These related schemes may be better suited for scaling to higher repetition rates. The 10 GHz repetition rate demonstrated here is already sufficiently high for application to comb-based RF photonics amplitude [25] and phase [31,32] filters. Figure 2(a) shows the optical spectrum of the output comb, which has ~40 lines, and whose shape agrees very well with a Gaussian fit.…”

Section: Gaussian Pulse Generationmentioning

confidence: 84%

“…In summary, we have generated a flat-topped optical frequency comb at 10-GHz repetition rate covering the whole C-band with >3.64 THz or ~365 lines within 3.5 dB power variation by seeding a directly generated 3.1-ps Gaussian pulse train from an electro-optic modulated comb followed by a HNLF in the normal dispersion regime. The combination of broad bandwidth, flatness and the demonstrated high degree of coherence should enable further applications in ultrafast photonics such as microwave photonic phase filters [31,32], for which the accurate synthesis of optical waveforms with a large time-bandwidth product is of paramount importance.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristics of this comb source are promising for the realization of high-performance microwave photonic filters [30], where the ultimate limit in the achievable time-bandwidth product is directly proportional to the number of comb lines. This supercontinuum comb has already been demonstrated to be a promising source for such applications, with excellent stability in spectral amplitude, a large number of comb lines, and a broad bandwidth contributing to programmable microwave photonic phase filters with record time-bandwidth product [32].…”

Section: Gaussian Pulse Generationmentioning

confidence: 99%

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Supercontinuum-based 10-GHz flat-topped optical frequency comb generation

et al. 2013

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The generation of high-repetition-rate optical frequency combs with an ultra-broad, coherent and smooth spectrum is important for many applications in optical communications, radio-frequency photonics and optical arbitrary waveform generation. Usually, nonlinear broadening techniques of comb-based sources do not provide the required flatness over the whole available bandwidth. Here we present a 10-GHz ultra-broadband flat-topped optical frequency comb (> 3.64-THz or 28 nm bandwidth with ~365 spectral lines within 3.5-dB power variation) covering the entire C-band. The key enabling point is the development of a pre-shaping-free directly generated Gaussian comb-based 10-GHz pulse train to seed a highly nonlinear fiber with normal dispersion profile. The combination of the temporal characteristics of the seed pulses with the nonlinear device allows the pulses to enter into the optical wave-breaking regime, thus achieving a smooth flat-topped comb spectral envelope. To further illustrate the high spectral coherence of the comb, we demonstrate high-quality pedestal-free short pulse compression to the transform-limited duration.

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Section: Gaussian Pulse Generationmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Gaussian Pulse Generationmentioning

confidence: 99%

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Supercontinuum-based 10-GHz flat-topped optical frequency comb generation

et al. 2013

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“…1 in order to provide a GS-OFCG with an optical span above 1 THz. Recent works on the expansion of OFCG consider the use of cascaded phase modulators and intensity modulator elements [37], resulting in a flat optical spectra exceeding 3 THz [38]. Other techniques are based on polarization modulation [39].…”

Section: Optical Comb Frequency Spanmentioning

confidence: 99%

Continuous-Wave Sub-THz Photonic Generation With Ultra-Narrow Linewidth, Ultra-High Resolution, Full Frequency Range Coverage and High Long-Term Frequency Stability

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Dios

Prior

et al. 2013

IEEE Trans. THz Sci. Technol.

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IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.1 Abstract-We report on a photonic system for generation of high quality Continuous Wave (CW) sub-THz signals. The system consists on a Gain-Switching-based Optical Frequency Comb Generator (GS-OFCG), a two-optical-modes selection mechanism and a n-i-pn-i-p superlattice photomixer. As mode selection mechanism, both selective tunable optical filtering using FabryPerot Tunable Filters (FPTF) and Optical Injection Locking (OIL) are evaluated. The performance of the reported system surpasses in orders of magnitude the performance of any commercially available optical mm-wave and sub-THz generation system in a great number of parameters. It matches and even overcomes those of the best commercially available electronic THz generation systems. The performance parameters featured by our system are: linewidth <10 Hz at 120 GHz, complete frequency range coverage (60-140 GHz) with a resolution in the order of 0.1 Hz at 120 GHz (10 -12 of generated frequency), and high long term frequency stability (5 Hz deviation over one hour). Most of these values are limited by the measurement instrumentation accuracy and resolution, thus the actual values of the system could be better than the reported ones. The frequency can be extended straightforwardly up to 1 THz extending the OFCG frequency span. This system is compact, robust, reliable, and offers a very high performance, especially suited for sub-THz photonic Local Oscillators and high resolution spectroscopy.

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“…Pulse compression is usually realized by matched filtering a frequency chirped or phase coded microwave pulse in the radar receiver. Recently, photonic generation of phase-coded pulses has attracted great attention for its large bandwidth and high frequency which may not be achievable using currently available electronic techniques [2]- [8]. The spatial light modulator (SLM)-based pulse shaping technique, which is implemented in free space, has been demonstrated for generating reconfigurable frequency-chirped or phase-coded RF pulses [9].…”

Section: Introductionmentioning

confidence: 99%

Photonic Generation of Phase Coded Microwave Pulses Using Cascaded Polarization Modulators

Wang

et al. 2013

IEEE Photon. Technol. Lett.

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We demonstrate a technique of generating a binary phase coded microwave pulse based on two cascaded polarization modulators (PolMs). The first PolM (PolM1) followed by an optical band-pass filter is used to generate two phase-locked and polarization orthogonal optical frequencies. The second PolM (PolM2) aims to change their polarization states. A polarizer attached to the output of PolM2 allows only one of the two optical frequencies passing, or combines them with positive/negative phase difference. By changing the voltage level of the electrical modulation signal applied to PolM2, a series of binary phase coded microwave pulses is directly generated from a continuous wave microwave signal in the optical domain. In the proposed system, the precise amplitude control or amplification of the modulation signal are avoided. The waveform of the generated pulse is very stable. For a proof-of-concept experiment, a series of 25-GHz pulses with ∼2.08-ns pulse duration and ∼10.24-ns repetition time is generated. The pulses are phase coded by a 13-bit Barker code.

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Programmable microwave photonic phase filters with large time-bandwidth product based on ultra-broadband optical frequency comb generation

Cited by 3 publications

References 17 publications

Supercontinuum-based 10-GHz flat-topped optical frequency comb generation

Supercontinuum-based 10-GHz flat-topped optical frequency comb generation

Continuous-Wave Sub-THz Photonic Generation With Ultra-Narrow Linewidth, Ultra-High Resolution, Full Frequency Range Coverage and High Long-Term Frequency Stability

Photonic Generation of Phase Coded Microwave Pulses Using Cascaded Polarization Modulators

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