Optical Signal Processing Aided by Optical Frequency Combs

Willner, Alan E.; Fallahpour, Ahmad; Zou, Kaiheng; Alishahi, Fatemeh; Zhou, Huibin

doi:10.1109/jstqe.2020.3032554

Cited by 29 publications

(9 citation statements)

References 96 publications

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“…For the case of cascading an MZM with a PM, we can express the output electric field in the time domain as [15] :…”

Section: Electro-optic Comb Generationmentioning

confidence: 99%

“…It is also possible to generate OFCs using a cascade of PMs and IMs, e.g., 3 PMs and an IM, or cascading a DD-MZM and a PM. Of course, cascading three or more optical modulators leads to a more complex system which requires greater control over tuning the phase shifters between the modulators and proper adjustment of the driving RF power [15,28] .…”

Section: Electro-optic Comb Generationmentioning

confidence: 99%

“…An OFC can be used as an optical frequency ruler for precision spectroscopy and was recognized with half of the 2005 Nobel Prize in Physics awarded to Hänsch and Hall [3,4] . Over the years, the generation of OFCs has been studied intensively and their use in diverse applications have been reported, including optical frequency metrology [5] , spectroscopy [6,7] , precision distance measurement (Li-DAR) [8] , astronomical spectrograph calibration [9,10] , optical synthesis [11] , RF and microwave photonic (MWP) signal processing [12][13][14] , and optical communications [15][16][17] , amongst others. For example, in optical communications, OFCs can be used to generate sinc-shaped Nyquist pulses which, in turn, can be applied to Nyquist OTDM transmission.…”

Section: Introductionmentioning

confidence: 99%

“…However, the formation dynamics can be complex and in order to obtain a comb with stable amplitude and phase, sophisticated control techniques are required. Moreover, for OFC generation with Kerr or chaos assisted combs, obtaining a flat spectrum as well as tunability of the comb spacing and/or the number of comb lines remains challenging [15] .…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in integrated electro-optic frequency comb generation

et al. 2021

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Optical frequency combs have emerged as an important tool enabling diverse applications from test-and-measurement, including spectroscopy, metrology, precision distance measurement, sensing, as well as optical and microwave waveform synthesis, signal processing, and communications. Several techniques exist to generate optical frequency combs, such as mode-locked lasers, Kerr micro-resonators, and electro-optic modulation. Important characteristics of optical frequency combs include the number of comb lines, their spacing, spectral shape and/or flatness, and intensity noise. While mode-locked lasers and Kerr micro-resonators can be used to obtain a large number of comb lines compared to electro-optic modulation, the latter provides increased flexibility in tuning the comb spacing. For some applications in optical communications and microwave photonics, a high degree of integration may be more desirable over a very large number of comb lines. In this paper, we review recent progress on integrated electro-optic frequency comb generators, including those based on indium phosphide, lithium niobate, and silicon photonics.

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“…For the case of cascading an MZM with a PM, we can express the output electric field in the time domain as [15] :…”

Section: Electro-optic Comb Generationmentioning

confidence: 99%

Section: Electro-optic Comb Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recent progress in integrated electro-optic frequency comb generation

et al. 2021

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“…Our system, when combined with THz photomixers, would enable low-cost, compact, and power-efficient sources for agile THz comb generation, paving the way towards a new generation of THz applications.Optical frequency combs (OFCs) have been identified as a key building block for many applications ranging from spectroscopy 1,2 and lidar 3 to optical communications. [4][5][6] The ubiquity and versatility of frequency combs naturally made them a crucial field of research, especially in photonics as tremendous performances can be reached thanks to the intrinsic advantages of light and light technology. Several photonic techniques and platforms have been demonstrated for generating frequency combs covering the visible to the THz spectral range.…”

mentioning

confidence: 99%

Agile THz-range spectral multiplication of frequency combs using a multi-wavelength laser

Abdollahi

Ladouce

Marin-Palomo

et al. 2023

Preprint

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On-chip frequency comb sources have emerged as a revolutionary technology that enables broadband frequency combs with unprecedented compactness, energy efficiency, and cost-effectiveness. This technology has found widespread applications ranging from spectroscopy and lidar to telecommunications. However, on-chip comb sources face a fundamental trade-off between controllability and bandwidth: Broadband combs, generated in microresonators, lack free-spectral range or spectral envelope control, while combs generated with electro-optic modulators can be carefully tailored but are limited in bandwidth. Here, we present a novel approach to overcome this trade-off by enabling agile spectral multiplication of a narrowband comb. We demonstrate that by exploiting the nonlinear dynamics of a multi-wavelength semiconductor laser under modulated optical injection, we can achieve spectral multiplication of an injected narrowband comb at frequency offsets of 26 GHz, 54 GHz, and up to 1.3 THz. Our approach incorporates on-chip optical feedback control that allows for high suppression ratio and nanosecond-scale tuning of the offset frequency. We show that this approach is scalable and can cover a range of several THz with a suitable laser design, compatible with generic foundry platforms. Our system, when combined with THz photomixers, would enable low-cost, compact, and power-efficient sources for agile THz comb generation, paving the way towards a new generation of THz applications.

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