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Integrated Photonics Laboratory

Integrated Photonics is one of the frontier technologies with significant research value in the application areas of information processing, computation, detection, metrology, etc. In particular, integrated photonics plays a crucial role in many key applications of quantum information and quantum sensing, realizing key components such as quantum light sources and programmable photonic networks.

We aim to develop ultra-low-loss integrated photonic chip technology, build a mature and complete R&D platform for integrated optical devices covering design, simulation, foundry, and characterization, and carry out their applications in telecommunication, optical computing, metrology, microwave photonics, and quantum technology.

RESEARCH

A chip-integrated comb-based microwave oscillator

Here, we demonstrate the first, fully hybrid-integrated, microcomb-based microwave oscillator at 10.7 GHz. The chip device, powered by a customized microelectronic circuit, leverages hybrid integration of a high-power DFB laser, a silicon nitride microresonator of a quality factor exceeding 25 × 10^6, and a high-speed photodetector chip of 110 GHz bandwidth (3 dB) and 0.3 A/W responsivity.

Arbitrary-phase locking of fiber unbalanced Mach-Zehnder interferometers

Here we demonstrate an innovative method for arbitrary-phase locking of fiber unbalanced Mach-Zehnder interferometers. Compared with existing methods, our method is much simpler. We showcase the preparation and characterization of a narrow-band, energy-time-entangled photon state generated in integrated nonlinear microresonators, where two-photon interference visibility reaches 0.993(6).

Ultralow-Loss Integrated Photonics Enables Bright, Narrowband, Photon-Pair Sources

Here, we demonstrate an integrated, microresonator-based, narrowband photon-pair source. The integrated microresonator, made of silicon nitride and fabricated using a standard CMOS foundry process, features ultralow loss down to 0.03 dB/cm and intrinsic 𝑄 factor exceeding 10^7. The photon-pair source has brightness of 1.17×10^9 Hz/mW^2/GHz and linewidth of 25.9 MHz, both of which are record values for silicon-photonics-based quantum light source.

A wideband, high-resolution vector spectrum analyzer for integrated photonics

Here we demonstrate a novel vector spectrum analyzer (VSA) that is capable of characterizing passive devices and active laser sources in one setup. Such a dual-mode VSA can measure loss, phase response, and dispersion properties of passive devices. It also can coherently map a broadband laser spectrum into the RF domain. The VSA features a bandwidth of 55.1 THz (1260–1640 nm), a frequency resolution of 471 kHz, and a dynamic range of 56 dB.

Frequency-comb-linearized, widely tunable lasers for coherent ranging

Here we present an approach to characterize laser chirp dynamics using an optical frequency comb. The instantaneous laser frequency is tracked over terahertz bandwidth at 1 MHz intervals. In addition, with acquired knowledge of laser chirp dynamics, we demonstrate a simple frequency-linearization scheme that enables coherent ranging without any optical or electronic linearization unit.

Programmable access to microresonator solitons with modulational sideband heating

Here, we demonstrate an approach to manage the photo-thermal effect and facilitate soliton generation. The approach is based on a single phase-modulated pump, where the generated blue-detuned sideband synergizes with the carrier and thermally stabilizes the microresonator. We apply this technique and demonstrate deterministic soliton generation of 19.97 GHz repetition rate in an integrated silicon nitride microresonator.

Foundry manufacturing of tight-confinement, dispersion-engineered, ultralow-loss silicon nitride photonic integrated circuits

In this work, we demonstrate the first foundry-standard fabrication process of Si3N4 PICs with only 2.6 dB/m loss, thickness above 800 nm, and near 100% fabrication yield on 6-inch (150 mm diameter) wafers. Merging with advanced heterogeneous integration, active ultralow-loss Si3N4 integrated photonics could pave an avenue to addressing future demands in our increasingly information-driven society.

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