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We demonstrate on-chip multi-channel phase-sensitive amplification in a nonlinear waveguide, achieving 5 dB net gain and 15 dB extinction ratio. We show the manipulation of individual channels in a multi-channel scheme through controlling the initial phases.
We introduce an intra-cavity actively mode-locked excitation scheme for nonlinear microring resonators that removes the need for external laser excitation in the generation of pulsed two-photon frequency combs. We found a heralded anti-bunching dip of 0.245 and maximum coincidence-to-accidental ratio of 110 for the generated photon pairs.
We demonstrate a passively mode-locked laser emitting 4.3 nanosecond Fourier-limited pulses with a record low spectral bandwidth of 104.9 MHz (more than 100 times narrower than previous realizations), allowing its full characterization in the radio-frequency domain.
We characterize four-wave mixing photon pair generation statistics in the chaotic pulsed regime associated with a self-locked nonlinear microcavity excitation scheme, and contrast these statistics against a pulsed actively mode-locked excitation.
In this contribution, we will review our recent activities in the development of double nested cavity lasers. Several stable operating regimes can be achieved over a wide range of conditions.
We demonstrate the use of integrated micro-resonator based optical frequency comb sources as the basis for transversal filtering functions for microwave and radio frequency photonic filtering and advanced functions.
We propose and experimentally demonstrate the enhancement of filtering quality factor (Q) and extinction ratio (ER) of an integrated micro-ring resonator through the use of an integrated Fabry-Perot cavity. Up to 11-times improvement in Q, together with an 8-dB increase in ER, are experimentally achieved.
We present a theoretical analysis of four-wave mixing in integrated silicon-graphene oxide (Si-GO) hybrid waveguides for two waveguide structures. We show that up to ∼ 39 dB enhancement in conversion efficiency (CE) can be achieved.
We propose and experimentally demonstrate a reconfigurable photonic RF differentiator based on a Kerr frequency comb generated in an integrated nonlinear microring resonator. The RF magnitude and phase responses are experimentally characterized. Systems demonstrations for Gaussian input signals are also performed.
Entangled photon-pair sources are key building blocks towards the realization of applications in quantum information processing [1], quantum communications [2], as well as imaging and sensing with resolutions exceeding the classical limit [3]. The generation of, e.g. polarization, time-energy and time-bin entangled photon-pairs has been demonstrated using spontaneous parametric down-conversion (SPDC)...
The third-order process of spontaneous four-wave mixing (SFWM) has seen increasing use due to the CMOS-incompatibility and difficulty of integrating second-order material platforms, as well as due to the presence of third-order nonlinearities in common platforms. In integrated optics, SFWM's low efficiency is often compensated using on-chip nonlinear microcavities [1], however, excitation schemes...
Phase-sensitive amplification (PSA) is a nonlinear optical interaction providing attractive functionalities for all-optical classical and quantum signal processing with a wide range of promising applications, such as regeneration of high modulation formats [1] and amplification of entangled single-photon sources [2]. To exploit PSA in a scalable and compact implementation, this technique has been...
Optical frequency combs in microresonators [1] or microcombs have generated significant attention in recent decades. Specifically, microcombs can be generated by resonantly coupling a powerful CW laser light in a microcavity, inducing multiple frequency oscillation by parametric generation. A well-known route to comb generation starts from the modulation instability (MI) of the pump. MI generates...
Microresonator based frequency combs or microcombs have attracted considerable interest in recent years as they would benefit a widespread of applications including high speed communication system, metrology, ultrafast optical clocks and on chip optical signal processing. A great amount of work on microcombs has been done in the past few years; coherent sources based on optical parametric generation...
Filter-Driven four wave mixing (FD-FWM) lasers based on microresonators are a family of mode-locked lasers capable of exciting multiple pulses per main cavity round trip [1]. They are capable of a stable output at hundreds of GHz repetition rates. Potential applications of such a laser include frequency comb generation and optical clocks [2]. We present the results of the characterisation of the FSR...
Many different mode-locking techniques have been realized in the past [1, 2], but mainly focused on increasing the spectral bandwidth to achieve ultra-short coherent light pulses with well below picosecond duration. In contrast, no mode-locked laser scheme has managed to generate Fourier-limited nanosecond long pulses, which feature narrow spectral bandwidths (∼MHz regime) instrumental to applications...
Photonic devices operating in the mid-IR (3 μm to 13μm wavelength range) are of great interest for a wide range of applications, such as free-space communications, environmental monitoring or defence. Group IV-based material platforms [1], such as silicon-on-insulator (SOI)[2] and silicon-on-sapphire (SOS)[3] have attracted significant interest for mid-IR integrated photonics. However, absorption...
The recently-introduced use of integrated frequency combs (on-chip light sources with a broad spectrum of evenly-spaced frequency modes, generated by four-wave mixing in optically-excited nonlinear microcavities) below optical parametric oscillation threshold for quantum state generation has provided a solution for scalable and multi-mode quantum sources [1, 2]. Pulsed quantum frequency combs, in...
There is a growing interest in generating mid-infrared (mid-IR) supercontinuum (SCG) using CMOS compatible platforms for applications such as, optical coherence tomography and molecular spectroscopy [1, 2]. SCG spanning from the telecom band to the SWIR (< 3 μm) has already been achieved using silicon-based platforms such as silicon-on-insulator, silicon nitride-on-insulator and silicon-germanium-on-insulator...
The interplay between ultrafast and slow nonlinearities, like Kerr and thermo-optical nonlinearities, is well-known for generating bistability, self-pulsing and chaotic regimes in optical microcavities. These effects have been observed in different kinds of devices, such as doped silica glass optical microcavities with high refractive index [1], and numerical models have been investigated to provide...
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