Optical frequency comb based on nonlinear spectral broadening of a phase modulated comb source driven by dual offset locked carriers

Nagarjun, K. P.; Vikram, B. S.; Prakash, Roopa; Singh, Ajay; Selvaraja, Shankar Kumar; Supradeepa, V. R.

doi:10.1364/ol.381319

Cited by 12 publications

(3 citation statements)

References 22 publications

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“…In Ref. [19], a flexible method for generating a wideband OFC source in the C-band is introduced. This is achieved by utilizing a nonlinear spectrum broadening technique on a phase-modulated OFC, driven by dual frequency offset locked carriers.…”

Section: Related Workmentioning

confidence: 99%

Generation of Broadband Optical Frequency Comb by Interfering Dual Lasers in Electro-Optic Modulators

Ujjwal,

Kumar,

Bhat

2023

IEEE Access

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In this article, we proposed two schemes for generating a broadband optical frequency comb (OFC) source using dual laser sources. In the first proposed technique, the OFC is generated using a cascaded single-drive Mach-Zehnder modulator (MZM) and dual-drive Mach-Zehnder modulator (DD-MZM). Here, the two CW light sources are modulated by each of the MZM, respectively. The first single-drive MZM generates the subcarriers, while The second DD-MZM carries out intensity modulation on the output spectrum generated by the MZM, ensuring that the power fluctuations of both even and odd sidebands are adjusted to an equal level. The second approach involves replacing the single-drive MZM with a phase modulator (PM). The center frequencies of laser 1 and laser 2 must be carefully set to achieve a nonoverlapping or gap-free comb spectrum. The frequency of the RF signal driving the modulators determines the spacing between the laser frequencies. In order to illustrate this aspect, we have utilized three distinct RF signal frequencies: 10 GHz, 16 GHz, and 20 GHz. Furthermore, we have examined the constraints that impact the estimation of the center frequency of laser 2, aiming for a non-overlapping and gap-free comb spectrum. By considering these constraints, we can ensure the successful generation of a uniform and stable comb spectrum with the desired characteristics in our proposed approach. The theoretical and primary analysis of cascaded single-drive MZM and DD-MZM, as well as cascaded PM and DD-MZM, is also investigated, and simulation results confirm the findings. By employing our proposed approach, OFC achieves a significant number of comb lines while exhibiting a power deviation of ∼ 2 dB in comparison to single laser configurations.

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Section: Related Workmentioning

confidence: 99%

Generation of Broadband Optical Frequency Comb by Interfering Dual Lasers in Electro-Optic Modulators

Ujjwal,

Kumar,

Bhat

2023

IEEE Access

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“…Furthermore, two individual slave lasers were injection-locked to a phase-modulated master source, realizing a high degree of coherence [30,31]. In addition, two electro-optic combs originating from independent seed sources offset by 100 GHz are phase-correlated by a heterodyne optical frequency locked loop [32]. However, the proposed methods require multiple lasers for pumping, which obviously increases the complexity and cost of the system.…”

Section: Introductionmentioning

confidence: 99%

Optical frequency comb generation based on spectral broadening of a phase locked dual-wavelength microcavity laser

Wang

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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A highly coherent optical frequency comb (OFC) based on spectral broadening of a phase-locked dual-wavelength microcavity laser is presented. By directly modulating the microcavity laser to generate multiple sidebands, the cross-injection locking of the dual modes is achieved and the beat-signal linewidth is improved from 13.5 MHz to less than 100 Hz. Subsequently, 21 flat comb teeth in a ±3 dB power variation are achieved by combining a phase modulator. Finally, an OFC with a bandwidth of 16 nm is successfully realized by narrowing the optical pulse and spectral broadening in a commercial nonlinear optical fiber. The repetition rate has a low phase noise of -102 dBc/Hz at 10 kHz offset, demonstrating the generated OFC has a high degree of coherence.

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“…2,8,9) In addition, the spectrum bandwidth can be extended by coherently synthesizing two EO combs with distinct center wavelengths. [10][11][12][13] The phase noise of comb modes in an EO comb mainly comes from the phase noise of the CW laser (<1 kHz) and the phase noise of the RF synthesizer (>1 kHz). 8) The phase noise of the comb modes increases with comb mode number due to the accumulated phase noise from RF synthesizer.…”

mentioning

confidence: 99%

Broadband coherently synthesized two-color electro-optic frequency combs with phase noise suppression

Tian

Kato

et al. 2022

Appl. Phys. Express

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A coherently synthesized 1550/1560 nm two-color EO comb is generated by modulating two continuous-wave lasers with common EO modulators and phase locking their beat note. Compared with a single-color EO comb, the phase noise of comb modes that accumulated from RF synthesizer is effectively suppressed in our coherently synthesized two-color EO comb, especially at > 100 kHz Fourier frequency. Besides, a broader spectrum is demonstrated in a coherently synthesized 1535/1560 nm two-color EO comb, with 60-nm total spectrum span. The coherently synthesized two-color EO combs are expected to be applied in coherent communication, spectroscopy, absolute distance measurement, etc.

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Optical frequency comb based on nonlinear spectral broadening of a phase modulated comb source driven by dual offset locked carriers

Cited by 12 publications

References 22 publications

Generation of Broadband Optical Frequency Comb by Interfering Dual Lasers in Electro-Optic Modulators

Generation of Broadband Optical Frequency Comb by Interfering Dual Lasers in Electro-Optic Modulators

Optical frequency comb generation based on spectral broadening of a phase locked dual-wavelength microcavity laser

Broadband coherently synthesized two-color electro-optic frequency combs with phase noise suppression

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