Generation of a multi-wavelength source spanning the entire C-band by nonlinear spectral broadening of dual-carrier electro-optic frequency combs

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

doi:10.1364/osac.401107

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…In Ref. [20], the authors utilize the spectral and temporal properties of a dual carrier electro-optic OFC to simultaneously enhance the stimulated Brillouin scattering (SBS) threshold and improve the widening process based on self-phase modulation (SPM). This technique produces 124 comb lines at a repetition rate of 25 GHz and a within a power variation of around 10 dB.…”

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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“…To faithfully represent this aspect, the measured RF magnitude spectrum of the noise source (shown in figure 1) is combined with the synthesized phase spectra to attain instances of noise voltage (v noise inst ). The transfer function of the phase modulator is utilized to realize the noise phase modulation (equation ( 1)) [23].…”

Section: Pma With Cfwmmentioning

confidence: 99%

“…Here the V π of the modulator is tuned to match the linewidths of the experimentally obtained higher order mixing products (third-order to fifth-order). Kerr effect in HNLF is incorporated to emulate the FWM (equations ( 2) and ( 3)) [23,24], and the dispersion is ignored (zero-dispersion wavelength ∼1550 nm). E laser is the electric field of the unmodulated laser.…”

Section: Pma With Cfwmmentioning

confidence: 99%

Widely linewidth tunable lasers through cascaded four-wave mixing based phase modulation amplification

Vikram

Prakash

Supradeepa

2021

J. Opt.

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We demonstrate wide-range linewidth-tuning of a narrow-linewidth laser in the C-band up to 40 GHz through cascaded four-wave mixing (CFWM) based phase modulation amplification. Stimulated Brillouin scattering (SBS) severely limits the power scaling of narrow-linewidth lasers. Continuous tuning of the linewidth or temporal coherence of the laser to mitigate SBS is conventionally achieved through external phase modulation with white noise or other RF waveforms. However, the range of linewidth tuning is limited by the bandwidth and power of the electro-optic modulator. We overcome this through the use of FWM as a linewidth multiplier. To achieve linewidth multiplication, two tunable pumps line-broadened in electro-optic phase modulators with white noise are power scaled and propagated through highly nonlinear fiber. We achieve linewidth tuning up to ∼4 GHz using control of the noise waveform, while CFWM achieves a 10× multiplication of linewidth up to 40 GHz at a fixed wavelength. Linewidth tuning can be further scaled through power scaling or cascading multiple nonlinear stages. The proposed technique would be useful in nonlinearity control in narrow-linewidth laser amplifiers, high-resolution optical imaging, LIDAR, and infrared spectroscopy.

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Nonlinear spectral broadening of a dual-carrier electro-optic frequency comb in a graphene oxide cladded silicon-rich nitride hybrid waveguide

Mondal¹,

Selvaraja²

2022

Appl. Opt.

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We demonstrate a detailed theoretical analysis describing the generation of an electro-optic comb (EOC) in the near-IR range through discrete phase and amplitude modulation driven by radio frequency (RF) signal generators. Furthermore, the generated EOC spectra suffer nonlinear spectral broadening while propagating through a hybrid Si-rich nitride (SRN) waveguide structure integrated with two-dimensional (2D) layered graphene oxide (GO) films. We perform a detailed analysis to investigate the influence of GO layers, pump wavelength detuning, and other waveguide parameters on the evolution of comb spectra propagating through the hybrid waveguide structure. Owing to the strong modal overlapping between the SRN waveguides and the highly nonlinear GO films, the nonlinearity of the system is enhanced effectively, and broadband comb spectra have been achieved in the near-IR range. Furthermore, we investigate the spectral coherence of the generated comb spectra under different input conditions. The results exhibit strong potential to generate a tunable frequency comb with high spectral coherence in the near-IR range by employing the hybrid waveguide structure.

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Generation of a multi-wavelength source spanning the entire C-band by nonlinear spectral broadening of dual-carrier electro-optic frequency combs

Cited by 5 publications

References 15 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

Widely linewidth tunable lasers through cascaded four-wave mixing based phase modulation amplification

Nonlinear spectral broadening of a dual-carrier electro-optic frequency comb in a graphene oxide cladded silicon-rich nitride hybrid waveguide

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