Flat, rectangular frequency comb generation with tunable bandwidth and frequency spacing

Preußler, Stefan; Wenzel, Norman; Schneider, Thomas

doi:10.1364/ol.39.001637

Cited by 22 publications

(8 citation statements)

References 16 publications

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“…The first modulator was driven with m = 25 radio frequencies with a frequency spacing of 500 MHz. By the bias voltage at the modulator and the RF power, the modulator was adjusted in a way that the 25 lower and upper frequency lines, or spectral copies of the input signal, have the same power as the carrier [12], [15], resulting in 51 copies of the input spectrum with an overall bandwidth of 51 × 500 MHz = 25.5 GHz. The second modulator is driven with just one radio frequency of 25.5 GHz, generated by an RF generator.…”

Section: Resultsmentioning

confidence: 99%

Orthogonal Full-Field Optical Sampling

et al. 2019

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Sampling is the first step to convert analogue into digital signals and one of the basic concepts for information handling. All practical sampling systems, however, are accompanied with errors. Bandwidth-limited signals can be seen as a superposition of time-shifted sinc pulses, weighted with the sampling values. Thus, due to orthogonality, bandlimited signals can be perfectly sampled by a corresponding sinc pulse with the correct time shift. But, sinc pulses are just a mathematical construct. Sinc pulse sequences, instead, can simply be generated by a rectangular, phase-locked frequency comb. For a high repetition-time to pulsewidth ratio, or a low duty cycle, the pulses of such a sequence come close to single sinc pulses, and thus, the sampling with them might lead to an almost ideal sampling. Here, we present the full-field optical sampling with a repetition-time to pulsewidth ratio of up to 153, or a duty cycle of around 0.65%. Since it enables amplitude and phase sampling, ultrahigh sampling rates should be possible.

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Section: Resultsmentioning

confidence: 99%

Orthogonal Full-Field Optical Sampling

et al. 2019

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“…First experiments have shown flat, rectangular frequency combs with a maximum bandwidth of 260 GHz with 27 equidistant frequency components and a power deviation of only 0.6 dB. 86 Additionally, almost ideal sinc-shaped Nyquist pulses with a pulse width of 3.5 ps and a duty cycle of 2.2% have been reported. 82…”

Section: Frequency Comb Processingmentioning

confidence: 98%

Stimulated Brillouin scattering gain bandwidth reduction and applications in microwave photonics and optical signal processing

Preußler

Schneider

2015

Opt. Eng

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Stimulated Brillouin scattering (SBS) is one of the most dominant nonlinear effects in standard singlemode fibers and its unique spectral characteristics, especially the narrow bandwidth, enable many different applications. Most of the applications would benefit from a narrower bandwidth. Different methods for the bandwidth reduction of SBS in optical fibers are presented and discussed. A bandwidth reduction down to 17% of the natural gain can be achieved by the superposition of the gain with two losses or the utilization of a multistage system. Furthermore, applications in the field of microwave photonics and optical signal processing like highresolution spectroscopy of communication signals, the storage of optical data packets as well as the processing of frequency combs including generation of millimeter waves and ideal sinc-shaped Nyquist pulses are presented.

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“…The SBS efficiency reaches zero when both of the pump and Stokes are orthogonally linear polarized (s 3 ¼ 0). This behavior can be used for many different applications from filters [19,32,33] via highresolution spectrum analyzers [34][35][36] to the generation of THz waves [37,38].…”

Section: The Polarization Effect Of Sbsmentioning

confidence: 99%

The State-of-the-Art of Brillouin Distributed Fiber Sensing

Feng¹,

Kadum²,

Schneider³

2019

Fiber Optic Sensing - Principle, Measurement and Applications

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The distributed Brillouin sensing technique has been developed rapidly since its first demonstration three decades ago. Numerous investigations on the performance enhancement of Brillouin sensors in respect to spatial resolution, sensing range, and measurement time have paved the way to its industrial and commercial applications. This chapter provides an overview of different Brillouin sensing techniques and mainly focuses on the most widely used one, the Brillouin optical time domain analysis (BOTDA). The history and the development of Brillouin sensing regarding the performance enhancement in various methods and their records will be reviewed, commented, and compared with each other. As well, related sensing errors and limitations will be discussed, together with the corresponding strategies to avoid them.

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Flat, rectangular frequency comb generation with tunable bandwidth and frequency spacing

Cited by 22 publications

References 16 publications

Orthogonal Full-Field Optical Sampling

Orthogonal Full-Field Optical Sampling

Stimulated Brillouin scattering gain bandwidth reduction and applications in microwave photonics and optical signal processing

The State-of-the-Art of Brillouin Distributed Fiber Sensing

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