Phase locking of a frequency agile laser

Crozatier, V.; Gorju, G.; Bretenaker, Fabien; Gouët, J.-L. Le; Lorgeré, I.; Gagnol, Claude; Ducloux, Eric

doi:10.1063/1.2424659

Cited by 33 publications

(16 citation statements)

References 13 publications

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“…We used a selfreferenced laser frequency stabilization scheme, compatible with high frequency agility. This technique has been proposed and demonstrated for high linear chirp by several research groups [22][23][24]. This scheme is based on phase-locked loop detection of a fiber-interferometer-derived heterodyne beat signal.…”

Section: B Hardware Overviewmentioning

confidence: 98%

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

Berger

Schwarz

Molin

et al. 2014

Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meetin

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We report on the experimental demonstration of a multi-gigahertz bandwidth RF spectrum analyzer exhibiting a resolution below 20 MHz, based on spectral hole burning in a rare-earth ion-doped crystal. To be compatible with demanding real-time spectrum monitoring applications, our demonstrator is designed to reach a high time resolution. For this purpose, we implemented the so-called "rainbow" architecture in which the spectral components of the incoming signal are angularly separated by the crystal, and are then acquired with a pixelated photodetector. The Tm 3+ :YAG crystal is programmed with a semiconductor DFB laser which frequency scan is servocontrolled and synchronized with the angular scan of a resonant galvanometric mirror, while a high-speed camera is used to acquire the spectra. In the perspective of future implementation within a system, the crystal is cooled below 4 K with a closedcycle cryostat. With this setup, we have been able to monitor and record the spectrum of complex microwave signals over an instantaneous bandwidth above 20 GHz, with a time resolution below 100 µs, 400 resolvable frequency components and a probability of intercept of 100 %.

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Section: B Hardware Overviewmentioning

confidence: 98%

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

Berger

Schwarz

Molin

et al. 2014

Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meetin

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“…At present, spectrum analysis over bandwidths of more than 10 GHz using SHB are single-shot measurements with resolutions limited by the linewidth of the lasers used to read and write the holes. Improving the resolution below 25 kHz will require ultrastable lasers, crystals cooled to below 4 K, and new techniques to stabilize chirped lasers [5,6]. Obtaining subkilohertz resolution of spectral features usually requires looking at coherent effects, such as photon echoes, instead of spectral holes.…”

Section: Introductionmentioning

confidence: 99%

Spectral hole burning for pulse repetition frequency analysis

Colice

Xiong

Wagner

2007

Journal of Luminescence

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“…Given these spectral parameters, one needs a laser whose frequency can be swept on several GHz in -20 Its, with a precision better than 50 kHz. We built an extended cavity diode laser with an intra-cavity electro-optic (EO) crystal, phase locked on an unbalanced MachZehnder interferometer [2]. Using this source, we demonstrated the chirp transform process with a bandwidth in excess of 1 GHz together with more than 20,000 independent frequency channels.…”

mentioning

confidence: 98%

Wide Band & high resolution optical coherent processing of RF signals in Er:YSO using a frequency agile laser

Crozatier

Gorju

Bretenaker

et al. 2007

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference

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Various microwave photonic processors using rare-earth-ion-doped crystals are under development, driven by the multi-GHz bandwidth and sub-MHz resolution potential of these crystals. Exploiting the available wide spectral band has long been a challenge, and only recently have some applications succeeded to. These include spectral analysis, range-Doppler processing. In these processors, the wide band advantage requires laser chirps covering the desired bandwidth in a few milliseconds with a precision better than the resolution aimed at. This is challenging. However in these applications one need not the chirp to be phase coherent all along its duration. Indeed, no phase relation need be conserved between the different frequency classes. Some coherent processing schemes require such phase relation. One of these is the so called photon echo chirp transform process [1], which can be used for instantaneous spectral analysis, compressive receivers, and also for arbitrary waveform generation. Up to now no convincing wide band demonstration could be performed of this coherent spectral process, because producing phase coherent, GHz-wide optical chirps of a few microseconds duration only is very challenging. We present here the first wide band and high resolution demonstration of the chirp transform algorithm. Because it is performed with a frequency agile laser source, this demonstration truly opens the way to the wealth of wide band spectral coherent processes that rare-earth ion doped crystals can handle.Experiments are performed with the 1536 nm transition of an Er3+:Y2SiO5 crystal, whose inhomogeneous width and dephasing time are 2 GHz and 150 pts respectively in our experimental conditions. Given these spectral parameters, one needs a laser whose frequency can be swept on several GHz in -20 Its, with a precision better than 50 kHz. We built an extended cavity diode laser with an intra-cavity electro-optic (EO) crystal, phase locked on an unbalanced MachZehnder interferometer [2]. Using this source, we demonstrated the chirp transform process with a bandwidth in excess of 1 GHz together with more than 20,000 independent frequency channels. (a) 200 kHz (b) 1.0 05 0.4 0.71 200k (b) i7oo0 0.6-0.8-~~~~~~~~~~~~. (U Frequency (Hz) 0.6 00 50kkHz 0.4-~~~-~4~~~~~0 .4~~~~~~~. 0.0 H0.0-0 0.25 0.5 0.75 1 1.25 1.5 -42 0 2 4 6 8 10 Frequency (GHz) Time (ns) Fig. 1 (a) 1.5-GHz wide RF spectrum. The line is the spectrum given by our photon echo processor. The dots are the peaks height evaluated from the FFT of the RF signal. The inset shows the peak of the dashed part. The peak width is 67 kHz, Fourier-limited by the 15-his analysis duration. (b) Fourier transform of a 20-his long gate, sine modulated at 100 kHz.As can be seen on Fig 1(a) a 1.5-GHz wide spectrum can be analyzed in 15 Its, leading to a resolution of 67 kHz.The time-bandwidth product of 24,000 is, to our knowledge, the highest ever demonstrated for a photon-echo processor. The dynamic range is 25 dB in single shot regime, and can be raised to 32 dB when the spectrum is...

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Phase locking of a frequency agile laser

Cited by 33 publications

References 13 publications

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

Spectral hole burning for pulse repetition frequency analysis

Wide Band & high resolution optical coherent processing of RF signals in Er:YSO using a frequency agile laser

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Phase locking of a frequency agile laser

Cited by 33 publications

References 13 publications

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

20 GHz instantaneous bandwidth RF spectrum analyzer with high time-resolution

Spectral hole burning for pulse repetition frequency analysis

Wide Band &#x00026; high resolution optical coherent processing of RF signals in Er:YSO using a frequency agile laser

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Wide Band & high resolution optical coherent processing of RF signals in Er:YSO using a frequency agile laser