Multi-Band Operation of Flat-Top Supercontinuum Laser Sources With Programmable Repetition Rate up to 50 GHz

Song, Minje; Choi, Hyunjong; Choi, Gyudong; Han, Sang-Pil; Lim, Seungyoung; Lee, Taehyun; Song, Minhyup

doi:10.1109/jlt.2022.3169486

“…Even though the residual sources of phase noise may be low in magnitude, they potentially scale non-linearly such that their contributions in comb-lines far away from the central frequency becomes significant. This is specially important in applications like supercontinuum generation where nonlinear effects are used to broaden the initial comb [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Subspace tracking for phase noise source separation in frequency combs

Zibar,

Razumov,

Heebøll

et al. 2023

Preprint

0

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It is widely acknowledged that the phase noise of an optical frequency comb primarily stems from the common mode (carrier-envelope) and the repetition rate phase noise. However, owing to technical noise sources or other intricate intra-cavity factors, residual phase noise components, distinct from the common mode and the repetition rate phase noise, may also exist. We introduce a measurement technique that combines subspace tracking and multi-heterodyne coherent detection for the separation of different phase noise sources. This method allows us to break down the overall phase noise sources associated with a specific comb-line into distinct phase noise components associated with the common mode, the repetition rate and the residual phase noise terms. The measurement method allow us, for the first time, to identify and measure residual phase noise sources of a frequency modulated mode-locked laser.

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“…Even though the residual sources of phase noise may be low in magnitude, they potentially scale non-linearly such that their contributions in comb-lines far away from the central frequency becomes significant. This is specially important in applications like supercontinuum generation where nonlinear effects are used to broaden the initial comb [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Subspace tracking for phase noise source separation in frequency combs

Zibar,

Razumov,

Heebøll

et al. 2023

Preprint

0

View full text Add to dashboard Cite

It is widely acknowledged that the phase noise of an optical frequency comb primarily stems from the common mode (carrier-envelope) and the repetition rate phase noise. However, owing to technical noise sources or other intricate intra-cavity factors, residual phase noise components, distinct from the common mode and the repetition rate phase noise, may also exist. We introduce a measurement technique that combines subspace tracking and multi-heterodyne coherent detection for the separation of different phase noise sources. This method allows us to break down the overall phase noise sources associated with a specific comb-line into distinct phase noise components associated with the common mode, the repetition rate and the residual phase noise terms. The measurement method allow us, for the first time, to identify and measure residual phase noise sources of a frequency modulated mode-locked laser.

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“…By using an EO comb followed by a high nonlinear medium, spectrum broadening can be achieved. High nonlinear fibers (HNLF) have extensively been studied as spectral broadening medium in recent years 20,21 . However, this configuration is still bulky because hundreds of meters of HNLF are required to achieve a significant spectral broadening.…”

mentioning

confidence: 99%

Fast-reconfigurable frequency comb generation based on AlGaAsOI waveguide with electro-optic time lens

Ma,

Wang,

Pi

et al. 2024

Commun Phys

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Tunable optical frequency combs offer a flexible solution for specific applications such as dual-comb spectroscopy, optical communications and microwave photonics, delivering improved precision, compatibility, and performance. However, previously, there has been a trade-off between reconfigurability and system simplicity in comb generation. Here, we present a fast-switched repetition rate frequency comb system that utilizes an electro-optic modulation time-lens technique with a high third-order nonlinear AlGaAsOI waveguide. Only one stage of modulator is used in the time-lens system which significantly reduces the complexity of the overall system. Our system allows for tuning of the center wavelength from 1542 nm to 1556 nm, as well as independent adjustment of the repetition rates from 18 GHz to 26.5 GHz, enabling fast-switching capabilities. Additionally, our system exhibits a high pump-to-comb conversion efficiency of up to 67.9%. It also demonstrates robustness to temperature changes and environmental instability. All the involved devices can be integrated onto a single chip, making this comb suitable for various applications.

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Multi-Band Operation of Flat-Top Supercontinuum Laser Sources With Programmable Repetition Rate up to 50 GHz

Cited by 9 publications

References 40 publications

Subspace tracking for phase noise source separation in frequency combs

Subspace tracking for phase noise source separation in frequency combs

Subspace tracking for phase noise source separation in frequency combs

Fast-reconfigurable frequency comb generation based on AlGaAsOI waveguide with electro-optic time lens

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