We upgraded the original fabrication method based on melting commercially available ZBLAN (heavy metal fluoride glass) optical fiber to obtain high-quality-factor ZBLAN microspheres with a diameter of 250 to 400 μm. The whispering gallery modes were excited in fabricated microresonators by different coupling elements and the high Q-factors at both 1.55 μm and 2.64 μm were demonstrated. At 1.5 μm the intrinsic Q-factor of (5.4 ± 0.4) · 108 determined by material losses was obtained. For 2.64 μm the quality factor was measured as (1.13 ± 0.22) · 108.
Compact microresonator-based frequency comb sources are perspective elements of modern photonic technologies. They attract even more interest after the integrated device was demonstrated. The main disadvantage of the Kerr frequency combs is said to be the comparatively low generation power. However, this problem is not studied quite well. Previous studies concerned its dependence on the microresonator FSR, input power and coupling separately, expecting pump-to-comb efficiencies no more than five percents. Usually it is stated that the threshold power should be reduced to provide lower necessary pump and larger soliton existence range. However, the problem is quite complex as coupling also induce the changes into the loaded quality factor, threshold power and even the number of comb lines. Also more than 20% efficiency was demonstrated recently in the self-injection locking regime. Here we present the more comprehensive analysis of the comb generation efficiency optimization and show the theoretical way to reach the limit of 100%.
We have performed a theoretical study and made an experimental realization of a multi-frequency self-injection locking of an external cavity laser, composed of a gain-chip and an external mirror, to a high-Q-chip-scaled ring microresonator. We use a numerical model based on the rate equation system that accounts for spontaneous emission to describe a semiconductor laser and optical feedback from a high-Q cavity. It allowed us to investigate dynamics of the system and to find out regimes when several locked lines are emerged simultaneously via power redistribution over the frequency domain. Due to the well-known phenomenon of mode competition, the multifrequency regimes appear only when several conditions are met, otherwise only single-frequency locking regimes may occur. The performed experimental investigations have shown that it is possible to achieve such states deterministically if these conditions are fulfilled.
Generation of coherent frequency combs in optical microresonators at normal GVD is a challenging task. It is well known that they can be generated in the form of the flat-top solitonic pulses, platicons, via controllable mode interaction or modulated pump. However, such methods are rather complicated, requiring either sophisticated mode interactions, complex two-cavity systems or high-frequency modulators. Recent investigations have shown that the self-injection locking effect provides interesting possibilities for frequency comb generation. It has been shown that this effect not only provides laser stabilization due to the resonant backscattering of laser radiation from the high-quality-factor microresonator but also leads to the nontrivial nonlinear dynamics in the same microresonator. First, this has been demonstrated for bright solitons with an ordinary laser diode as a pump source. Recently, it has been shown experimentally that such approach is also applicable for platicon generation and does not require additional equipment. In our work we study this process in detail and identify different generation regimes depending on the combination of the pump power and the backscattering coefficient providing the self-injection locking effect. The range of parameters necessary for the efficient platicon generation is found. We also report a novel mechanism of platicon generation based on the thermal effects inevitable in real-life systems. We show that it is possible if thermal effects are negative (the direction of the thermal shift of the microresonator resonance is opposite to the direction of the nonlinear shift) and the ratio of the thermal relaxation time to photon lifetime is small enough. Different generation regimes are found, and the possibility of the turn-key operation regime is demonstrated.
Modified rate-equations model for a multi-mode semiconductor laser locked to the high-Q microresonator taking Bogatov effect into account is developed. The effects of the symmetric and asymmetric mode interactions are shown.
The effect of the self-injection locking (SIL) is well-known for many years in the theory of oscillations, radiophysics and optics and is actively used for the stabilization and spectral purification of the corresponding generators. Last years it has attracted even more attention due to the possibility of using such stabilized lasers as pump sources for the realization of the nonlinear processes in the same microresonators, simultaneously used for laser linewidth reduction. However, existing linear theories of the self-injection locking unable to predict soliton generation because enough value of the pump frequency detuning can not be obtained in the linear regime. The development of full nonlinear theory becomes even more important, since recently generation of the solitonic pulses at normal group velocity dispersion has been demonstrated in the self-injection locking regime
We developed an original model describing the process of the frequency comb generation in the self-injection locking regime and performed numerical simulation of this process. Generation of the dissipative Kerr solitons in the self-injection locking regime at anomalous group velocity dispersion was studied numerically. Different regimes of the soliton excitation depending on the locking phase, backscattering parameter and pump power were identified. It was also proposed and confirmed numerically that self-injection locking may provide an easy way for the generation of the frequency combs at normal group velocity dispersion. Generation of platicons was demonstrated and studied in detail. Parameter range providing platicon excitation was found.
Self-injection locking (SIL) is an effect of the oscillator frequency stabilization by means of a passive external high-quality cavity enabling frequency filtered coherent optical feedback to the oscillator. It is widely used in various photonic applications, including compact narrow-linewidth lasers and microcomb sources. While basic properties of this effect were studied in many theoretical and experimental works, deeper insight on its physical features and parameter space analysis allows us to build a model that describes its behavior and predicts at least an order of magnitude improvement of the stabilized laser linewidth reduction as compared to the best previous results. We find out a global maximum over all parameters and obtain analytical expression for the optimal stabilization coefficient. Influence of the resonator non-linearity and transition from the SIL to single cavity regime are discussed. Quality factor of the resonator appears to be a key parameter for effective SIL and oscillator stabilisation. Crystalline microresonators demonstrated the highest Q and a prism coupling is a robust method of its excitation, broadly used in applications. We developed and verified experimentally a new method of determining the key parameters of the chosen mode of the microresonator - quality factor and vertical index - based on the measurement of the locking bandwidth as a function of the resonator to prism distance. Unlike other methods it allows for the measurement to be made right in the SIL regime and does not require narrow-line lasers or fast photodetectors. A comparison with the FWHM and ringdown methods demonstrated excellent agreement.
We analyze in detail a scheme of the comb-calibrated frequency-modulated continuous-wave (FMCW) laser and study the accuracy of the laser frequency measurements. In this scheme the moment when the tunable laser frequency crosses the reference comb lines is obtained by filtering the heterodyne signal between the frequency comb and the tunable laser with a narrow band-pass filter. We show that the accuracy of the measured instantaneous frequency depends on the frequency sweep speed, bandwidth filter parameters and total phase noise of the laser and applied frequency comb. In this work we present the optimal ratio of frequency sweep and filter bandwidth for the given total phase noise and type of narrowband filter providing the highest frequency calibration accuracy.
Optical resonators with cubic nonlinearity were among the first simplest physical systems proposed for generation of squeezed states of light as well as for verification of quantum nondemolition measurement concept. These conventional squeezed states are characterized with Gaussian statistics and positive Wigner function and are frequently treated as semiclassical. In contrast, it is known that the quantum states resulting from the higher order self-phase modulation are characterized with negative Wigner function. Such states can be transformed to an imperfect Fock state via classical biasing. Using these known features, we have developed an experiment strategy for observation and characterization of the nonclassical state in a system based on a high-Q nonlinear optical microcavity. We discuss technical limitations for the state observation associated with the losses in the system and technical noise of the classical optical sources involved in the measurement.
We developed original model describing the process of frequency comb generation in the self-injection locking regime and performed numerical modelling of this process. Generation of dissipative Kerr solitons in the self-injection locking regime at anomalous GVD was observed and studied numerically. It was proposed that self-injection locking may provide easy way for generation of frequency comb at normal group velocity dispersion. This idea was investigated in detail and platicon generation was demonstrated. Parameter range providing platicon excitation was found.
The ultra-narrow linewidth diode lasers self-injection locked to high-Q crystalline microresonators are available commercially, providing the linewidth below 1 kHz for various wavelengths and enabling microcomb generation. Here we demonstrate a technique that allows applying this approach for photonic integrated chips containing microresonators and significantly narrow the laser diode (Fabry-Perot or DFB) linewidth due to self-injection locking to the silicon nitride (SiN) microresonator with high Q-factor. Considered laser diodes are CMOS-compatible, as well as integrated microresonators made of silicon nitride. This makes it possible to realize in the future large-scale production of laser devices based on microresonators.
We stabilized the InGaAsP/InP Fabry-Perot (FP) laser diode (Seminex, 100 mW, 1535 nm, 20 nm spectral width) and the DFB laser (Nolatech Company, 1550 nm, output power up to 20 mW) by different silicon nitride microresonators with Q-factor higher than one million (LIGENTECH Company). Microresonators with different free spectral ranges (1 THz, 150 GHz, 35 GHz) allowed observing the different regime of operation, single frequency, and multi-frequency, when different laser diode lines are suppressed. The spectral linewidth of each locked line was better than 20 kHz (limited by Ref. laser).
The developed technique allowed us to integrate different types of laser diodes with high-Q SiN microresonators and developed a fully integrated optical frequency comb source. We measured spectral characteristics (spectral linewidth, phase noises) of free running and locked states, the stabilization coefficient, and the locking range and compare these values to the theoretical estimations. We discuss requirements for the optical frequency comb generation in such systems and demonstrate measured spectra of optical combs. Also, we discuss possible applications of such system, operating in multi-frequency locking or comb regimes, and demonstrate the application for spectroscopy measurements.
During the last decade generation of frequency combs and different types of dissipative solitons was demonstrated and well-studied in high-Q optical microresonators with Kerr nonlinearity. However, recently, it was shown that it is also possible in microresonators with quadratic nonlinearity. In our work, we studied numerically the generation of coherent frequency combs in quadratically nonlinear microresonators via conventional frequency scan method for both second harmonic generation and downconversion processes. We revealed that under particular conditions it is possible to generate two-color flat-top solitonic pulses, platicons, using pump amplitude modulation or controllable mode interaction approach, if the signs of the group velocity dispersion (GVD) coefficients at interacting harmonics are opposite. For SHG process at each combination of GVD coefficients platicon generation was observed at both positive and negative pump frequency detunings from the linear microresonator resonance. Platicon generation was also demonstrated for the downconversion process. Platicon excitation was observed at positive detunings for the normal GVD at pump frequency and at negative detunings in the opposite case. For both SHG and downconversion processes, for the efficient platicon excitation one needs simultaneous accurate matching of the free spectral ranges at interacting harmonics and resonant eigenfrequencies. Excitation conditions and platicon generation domains were revealed for different generation methods, and properties of generated platicons were studied for various combinations of medium parameters.
Silicon is a widely used material in modern microelectronics and photonics. Extremely low optical losses in near and mid-IR wavelengths made it a promising material for whispering gallery mode (WGM) optical micro-resonators. But, till now its potential was not fully utilized because of the best-obtained quality factor - about 2 x 107 - remained orders of magnitude below the material absorption limit. In this work we experimentally demonstrated a quality factor above 109 for the WGM in millimetres size crystalline silicon resonators. Materials with different residual conductivity were compared. Application of original semi-spherical silicon coupler allowed to obtain up to 35% resonance peaks contrast.
We introduce a technique capable to produce and control stabilized single-frequency emission with a sub-kHz linewidth and independently soliton comb generation from a multi–frequency regular Fabry-Perot laser diode selfinjection locked to a high-Q optical microresonator. We also observed novel regimes of controllable single, dual, and multiple-frequency generation that may be useful for the creation of narrow-linewidth lasers required for the spectroscopy, LIDARs, and telecommunications. For analysis of the considered effects original theoretical models taking into account self-injection locking effect, mode competition and Bogatov asymmetric mode interaction were developed and numerical modeling was performed.
We report on the measurement of small stress fluctuations in loaded fused silica fibers using high-Q optical microcavity sensor with whispering-gallery modes. Axial force applied to the spherical whispering-gallery mode microcavity by the fiber attached in the polar area displaced the frequencies of whispering-gallery mode resonances, and enabled high-sensitivity measurement of the stress force variations. With quality factor of integrated microcavity sensor of (2-7)x107, the achieved spectral sensitivity of force measurement was <1x10-8 N/(root)Hz in the 102-103 Hz frequency range and about 2x10-10N/(root)Hz above 104 Hz.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.