Optical Phase Lock Loop as High-Quality Tuneable Filter for Optical Frequency Comb Line Selection

Bałakier, Katarzyna; Shams, Haymen; Fice, Martyn J.; Ponnampalam, Lalitha; Graham, Christopher; Renaud, Cyril C.; Seeds, A.J.

doi:10.1109/jlt.2018.2848961

Cited by 11 publications

(7 citation statements)

References 41 publications

(47 reference statements)

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“…In ref. [49], an OPLL was reported for comb line selection with an attenuation of noise and sidebands above 58 dB, with frequency offsets near 12 GHz. The OPLL offers wide tunability and the measured phase noise was below −100 dBc/Hz.…”

Section: Comb Line Selection Stagementioning

confidence: 99%

Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers

Betancur-Pérez

Martín-Mateos

Dios

et al. 2020

Sensors

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In this work, we present a multipurpose photonic integrated circuit capable of generating multiheterodyne complex Dual-Combs (DC) THz signals. Our work focuses on translating the functionality of an electro-optic tunable DC system into a photonic chip employing standard building blocks to ensure the scalability and cost efficiency of the integrated device. The architecture we analyze for integration is based on three stages: a seed comb, a mode selection stage and a DC stage. This final DC stage includes a frequency shifter, a key element to improve the final detection of the THz signals and obtain real-time operation. This investigation covers three key aspects: (1) a solution for comb line selection on GHz spaced combs using OIL or OPLL on photonic chips is studied and evaluated, (2) a simple and versatile scheme to produce a frequency shift using the double sideband suppressed carrier modulation technique and an asymmetric Mach Zehnder Interferometer to filter one of the sidebands is proposed, and (3) a multipurpose architecture that can offer a versatile effective device, moving from application-specific PICs to general-purpose PICs. Using the building blocks (BBs) available from an InP-based foundry, we obtained simulations that offer a high-quality Dual-Comb frequency shifted signal with a side mode suppression ratio around 21 dB, and 41 dB after photodetection with an intermediate frequency of 1 MHz. We tested our system to generate a Dual-Comb with 10 kHz of frequency spacing and an OOK modulation with 5 Gbps which can be down-converted to the THz range by a square law detector. It is also important to note that the presented architecture is multipurpose and can also be applied to THz communications. This design is a step to enable a commercial THz photonic chip for multiple applications such as THz spectroscopy, THz multispectral imaging and THz telecommunications and offers the possibility of being fabricated in a multi-project wafer.

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Section: Comb Line Selection Stagementioning

confidence: 99%

Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers

Betancur-Pérez

Martín-Mateos

Dios

et al. 2020

Sensors

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“…One of them is to phase lock an external tunable laser with one of the OFC modes, which is known as the optical phase-locked loop. [14][15][16] In this technique, the finite bandwidth of the servo systems and the frequency controlling actuators limit the locking performance, causing a deterioration in the phase noise level of the locked laser compared to the reference OFC mode. Another method is optical injection locking, which selectively amplifies a specific OFC line by injecting the OFC into a diode laser operating at a frequency close to the desired line.…”

Section: Introductionmentioning

confidence: 99%

Highly Discriminative Amplification of a Single Frequency Comb Line

Xiong,

Zhou,

Cao

et al. 2023

Laser & Photonics Reviews

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The optical power of a single line in optical frequency combs (OFCs) is inherently weak, so the extraction and amplification of a single OFC line is required for many high‐precision applications. In this work, a high gain, narrowband, and all‐polarization‐maintaining (PM) fiber Brillouin amplifier is introduced to address this issue. The use of PM fiber as the gain medium provides higher Brillouin gain and avoids polarization sensitivity to thermal and acoustic disturbance. The gain fiber is reduced to tens of meters with higher pump power, which is beneficial for the phase quality of the amplified comb line. Numerical simulations and experiments are performed to investigate the features of the Brillouin amplification process for an individual OFC line. Notably, direct generation of a Watt‐level single‐mode laser from an OFC is demonstrated, with a signal‐to‐noise‐ratio (SNR) of 47 dB and a side‐mode‐suppression‐ratio (SMSR) exceeding 60 dB, which represents the highest power, and best SNR and SMSR performance ever reported, to the best of the knowledge.

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“…Direct THz frequency-domain spectroscopy is comparatively less technologically mature, with few commercial systems produced [19]. Typically, these systems make use of free-running lasers, where the optically generated THz linewidth, and hence spectral resolution, is limited by the convolution of the two free-running laser spectral functions [20].…”

Section: Introductionmentioning

confidence: 99%

“…Typical semiconductor lasers have a significant linewidth due to fluctuations of the effective cavity length. Linewidths generally vary from 100 kHz for widely tunable external cavity diode lasers [30] to 2 MHz for distributed feedback (DFB) lasers [20].…”

Section: Introductionmentioning

confidence: 99%

Ultra-high-resolution software-defined photonic terahertz spectroscopy

Hermans

Seddon

Shams

et al. 2020

Optica

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A novel technique for high-resolution 1.5 µm photonics-enabled terahertz (THz) spectroscopy using software control of the illumination spectral line shape (SLS) is presented. The technique enhances the performance of a continuous-wave THz spectrometer to reveal previously inaccessible details of closely spaced spectral peaks. We demonstrate the technique by performing spectroscopy on LiYF 4 :Ho 3+ , a material of interest for quantum science and technology, where we discriminate between inhomogeneous Gaussian and homogeneous Lorentzian contributions to absorption lines near 0.2 THz. Ultra-high-resolution (<100 Hz full-width at half maximum) frequency-domain spectroscopy with quality factor Q > 2 × 10 9 is achieved using an exact frequency spacing comb source in the optical communications band, with a custom uni-traveling-carrier photodiode mixer and coherent down-conversion detection. Software-defined time-domain modulation of one of the comb lines is demonstrated and used to resolve the sample SLS and to obtain a magnetic field-free readout of the electronuclear spectrum for the Ho 3+ ions in LiYF 4 :Ho 3+ . In particular, homogeneous and inhomogeneous contributions to the spectrum are readily separated. The experiment reveals previously unmeasured information regarding the hyperfine structure of the first excited state in the 5 I 8 manifold complementing the results reported in Phys. Rev. B 94, 205132 (2016).Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Optical Phase Lock Loop as High-Quality Tuneable Filter for Optical Frequency Comb Line Selection

Cited by 11 publications

References 41 publications

Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers

Design of a Multipurpose Photonic Chip Architecture for THz Dual-Comb Spectrometers

Highly Discriminative Amplification of a Single Frequency Comb Line

Ultra-high-resolution software-defined photonic terahertz spectroscopy

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