Dual-pump frequency comb generation in normally dispersive optical fibers

Antikainen, Aku; Agrawal, Govind P.

doi:10.1364/josab.32.001705

Cited by 26 publications

(11 citation statements)

References 29 publications

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“…By looking at Fig. 2(b) we note that the input spec- trum has broadened considerably at a distance of 65 m (just before the first reflection), forming a frequency comb spanning from 1.02 µm to 1.12 µm through dualpump enhanced SPM [20]. Since there is a band of (discrete) frequencies that can reflect off the solitonic index barriers, the reflected frequencies also form bands around the theoretically predicted curve (solid black line).…”

Section: Role Of Temporal Reflectionsmentioning

confidence: 99%

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Temporal reflection as a spectral-broadening mechanism in dual-pumped dispersion-decreasing fibers and its connection to dispersive waves

2017

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We show that temporal reflections off a moving refractive index barrier play a major role in the spectral broadening of a dual-wavelength input inside a highly nonlinear, dispersion decreasing fiber. We also find that a recently developed linear theory of temporal reflections works well in predicting the reflected frequencies. Successive temporal reflections from multiple closely spaced solitons create a blue-shifted spectral band, while continuous narrowing of solitons inside the dispersion decreasing fiber enhances Raman-induced red shifts, leading to supercontinuum generation at relatively low pump powers. We also show how dispersive wave emission can be considered a special case of the more general process of temporal reflections. Hence our findings have implications on all systems able to support solitons.

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Section: Role Of Temporal Reflectionsmentioning

confidence: 99%

“…Another way to induce MI is to pump the fiber with two (or more) pumps of different wavelengths. SC and frequency comb generation using dual-wavelength pumping has been explored in numerous studies [16][17][18][19][20][21]. The dualpump configuration can have significant advantages over single-CW pumping.…”

Section: Introductionmentioning

confidence: 99%

Temporal reflection as a spectral-broadening mechanism in dual-pumped dispersion-decreasing fibers and its connection to dispersive waves

2017

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“…The interactions of dispersion and Kerr nonlinearity determine the field profile, frequency span, and stability of the generated OFC. Nonlinear Schrödinger equation [8,9], modal expansion approach [10], and coupled-mode equation models [11] were used to simulate the formation process and obtain a better understanding of the OFC formation mechanism. Meanwhile, the Lugiato-Lefever equation was widely used as an effective tool to explore the spatiotemporal evolution of OFCs in microresonators [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and temporal characterization of dual-pumped microring-resonator-based optical frequency combs

Wang

et al. 2017

Photon. Res.

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Dual-pumped microring-resonator-based optical frequency combs (OFCs) and their temporal characteristics are numerically investigated and experimentally explored. The calculation results obtained by solving the driven and damped nonlinear Schrödinger equation indicate that an ultralow coupled pump power is required to excite the primary comb modes through a non-degenerate four-wave-mixing (FWM) process and, when the pump power is boosted, both the comb mode intensities and spectral bandwidths increase. At low pump powers, the field intensity profile exhibits a cosine variation manner with frequency equal to the separation of the two pumps, while a roll Turing pattern is formed resulting from the increased comb mode intensities and spectral bandwidths at high pump powers. Meanwhile, we found that the power difference between the two pump fields can be transferred to the newly generated comb modes, which are located on both sides of the pump modes, through a cascaded FWM process. Experimentally, the dual-pumped OFCs were realized by coupling two self-oscillating pump fields into a microring resonator. The numerically calculated comb spectrum is verified by generating an OFC with 2.0 THz mode spacing over 160 nm bandwidth. In addition, the formation of a roll Turing pattern at high pump powers is inferred from the measured autocorrelation trace of a 10 free spectral range (FSR) OFC. The experimental observations accord well with the numerical predictions. Due to their large and tunable mode spacing, robustness, and flexibility, the proposed dual-pumped OFCs could find potential applications in a wide range of fields, including arbitrary optical waveform generation, high-capacity optical communications, and signal-processing systems.

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“…Aku A. et al . studied the two pump tunable OFC generation and its temporal evolution in normal dispersion fiber by numerical simulations 27 . For micro-cavities, theoretical analyses have been studied for dual-pump Kerr frequency combs generation in both normal and anomalous dispersion regimes 28 29 .…”

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confidence: 99%

Dual-pump Kerr Micro-cavity Optical Frequency Comb with varying FSR spacing

Wang

Chu

Little

et al. 2016

Sci Rep

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In this paper, we demonstrate a novel dual-pump approach to generate robust optical frequency comb with varying free spectral range (FSR) spacing in a CMOS-compatible high-Q micro-ring resonator (MRR). The frequency spacing of the comb can be tuned by an integer number FSR of the MRR freely in our dual-pump scheme. The dual pumps are self-oscillated in the laser cavity loop and their wavelengths can be tuned flexibly by programming the tunable filter embedded in the cavity. By tuning the pump wavelength, broadband OFC with the bandwidth of >180 nm and the frequency-spacing varying from 6 to 46-fold FSRs is realized at a low pump power. This approach could find potential and practical applications in many areas, such as optical metrology, optical communication, and signal processing systems, for its excellent flexibility and robustness.

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Dual-pump frequency comb generation in normally dispersive optical fibers

Cited by 26 publications

References 29 publications

Temporal reflection as a spectral-broadening mechanism in dual-pumped dispersion-decreasing fibers and its connection to dispersive waves

Temporal reflection as a spectral-broadening mechanism in dual-pumped dispersion-decreasing fibers and its connection to dispersive waves

Numerical simulation and temporal characterization of dual-pumped microring-resonator-based optical frequency combs

Dual-pump Kerr Micro-cavity Optical Frequency Comb with varying FSR spacing

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