Originally developed for metrology, optical frequency combs are becoming increasingly pervasive in a wider range of research topics including communications, spectroscopy, and radio or microwave signal processing. However, application demands these fields can be more challenging as they require compact sources with high tolerance to temperature variations that capable delivering flat comb spectra, power per tone, narrow linewidth signal-to-noise ratio. This work reports the generation flat,...

Abstract Emerging cloud applications such as virtual reality and connected car fleets demand guaranteed connections, well low stable latency, to edge data centres. Currently, user–cloud communications rely on time-scheduled frames through tree-topology fibre networks, which are incapable of providing connections with or latency cannot be scaled a larger number users. Here we show that frequency-referenced multiplexing method can provide bandwidth for time-critical applications. We use clock...

Photonic analog to digital conversion offers promise overcome the signal-to-noise ratio and sample rate trade-off in conventional converters (ADCs), critical for modern communications signal analysis. We propose using phase-stable dual frequency combs with a fixed spacing offset downconvert spectral slices of broadband enable high-resolution parallel digitization. To prove concept our proposed method, we demonstrate detection 10 GHz subcarrier modulated (SCM) 500 MHz bandwidth ADCs by...

Halide perovskites hold exceptional promise as cheap, low temperature solution-processed optoelectronic materials. Yet they are hindered by poor structural and chemical stability, rapidly degrading when exposed to moisture or air. We demonstrate a solution-phase method for infiltrating methylammonium lead bromide perovskite (CH3NH3PbBr3, MAPbBr3) into nanoporous GaN which preserved the green photoluminescence of after up 1 year storage under ambient conditions. Besides protective effect,...

Dual frequency combs are emerging as new tools for spectroscopy and signal processing. The relative phase noise of the tone pairs determines performance (e.g., signal-to-noise ratio) detected spectral components. Although previous research has shown that quality generally degrades with an increase in difference between pairs, scaling dual comb systems not been fully characterized. In this Letter, we model characterize a coherent electro-optic system. Our results show at high offset...

Dual frequency combs are emerging as highly effective channelizers for radio (RF) signal processing, showing versatile capabilities in various applications including Fourier mapping, analog-to-digital conversion and sub-sampling of sparse wideband signals. Although previous research has considered the impact comb power harmonic distortions individual systems, a rigorous comprehensive performance analysis is lacking, particularly regarding phase noise. This especially important considering...

In this paper, we investigate two categories of linear frequency-modulated chirp signals suitable for single-photodiode based coherent light detection and ranging (LiDAR) systems, namely, the continuous-wave (FMCW) single-sideband (SSB) signal amplitude-modulated double-sideband (DSB) signal, compare their achievable receiver sensitivity performance. The DSB requires a simpler transmitter design, as it is real-valued can be generated using single-drive Mach-Zehnder modulator (MZM), while SSB...

We demonstrate 2.5-GHz-spaced frequency multiplexing capable of aggregating 64 intensity-modulated end-users using low-speed electronic and optoelectronic components. All optical network units (ONUs) achieved high per-user capacity with dedicated bands, enabling future low latency applications.

Optical switching has attracted significant attention in recent research on data center networks (DCNs) as it is a promising viable route for the further scaling of hyper scale centers, so that DCNs can keep pace with rapid growth machine-to-machine traffic. It been shown optical clock synchronization enables sub-nanosecond and recovery time crucial to high performance optically switched DCN. Moreover, interconnect rate expected increase from current 100 Gb/s per fiber 800 beyond, requiring...

We demonstrate the generation, transmission, and intradyne detection of a single-wavelength 2.42-Tb/s (net data rate) signal. The electrical signals are generated via pair 114-GHz digital-bandinterleaved DACs.

The design and performance characteristics of a beam steering optical switch for multicore fibers (MCFs) are reported. Port count, core transmission crosstalk, or combination thereof can be optimized the required application. Decreasing port separation increasing maximum angle both increase whilst higher count larger mode field diameter capacity respectively, at expense greater intercore crosstalk. Potential losses from system misalignments fiber fabrication variations in pitch also...

We present the first power dissipation bounds for a generalised class of photonic analog to digital converters, and estimate their achievable efficiency compared conventional electronic designs.

We demonstrate a spectrally-sliced single-polarization optical coherent receiver with record 2.4-THz bandwidth, using 200-GHz tantalum pentoxide photonic crystal microring resonator as the local oscillator frequency comb.

We demonstrate a record high performance of frequency-interleaved analog-to-digital conversion using phase-noise-engineered dual frequency comb photonic technique, enabling 7 effective number bits (ENOB) for signals up to 40 GHz.

We demonstrate 2.5-GHz-spacing frequency multiplexing capable of aggregating 64 intensity-modulated end-users using low-speed electronic and optoelectronic components. All optical network units (ONUs) achieved high per-user capacity with dedicated bands, enabling future large-bandwidth low latency applications.

We demonstrate a performance improvement of dual-comb based optical analog-to-digital conversion methods. Through improved front-end design, we obtain 4.5 bits ENOB up to 12.5 GHz, representing 10 dB SINAD enhancement compared previous results.

We demonstrate clock-synchronized transmission of 128-byte optical packets at 51.2GBd. study the impact reference clock phase noise on misalignment and system scalability for high baud rate DC interconnects.

We demonstrate all-fiber frequency comb generation using a 10-mm-length silicon core fiber as the parametric mixer. achieved 8 dB spectral flatness over 20 nm bandwidth, generating 90 lines at 26 GHz line spacing.

Many efforts have examined the prospect of photonic based analog to digital converters (ADCs) and shown that they can substantially outperform their electronic counterparts in terms speed resolution. In this paper we analyse power consumption ADCs, which has not been meaningfully previous literature yet is a critical figure merit for conversion. Firstly, show quantum noise limited regime cannot exceed efficiency conventional designs any reasonable operating environment. However, further...

We present the first power dissipation bounds for a generalised class of photonic analog to digital converters, and estimate their achievable efficiency compared conventional electronic designs.

Photonic analog to digital conversion offers promise overcome the signal-to-noise ratio (SNR) and sample rate trade-off in conventional converters (ADCs), critical for modern communications signal analysis. We propose using phase-stable dual frequency combs with a fixed spacing offset downconvert spectral slices of broadband enable high resolution parallel digitization. To prove concept our proposed method, we demonstrate detection 10-GHz subcarrier modulated (SCM) 500-MHz bandwidth ADCs by...

Abstract The rise of timing-critical applications such as virtual reality and connected car fleets, combined with the rapid growth number user devices, creates new challenges for latency reliability user-cloud data communications. Currently communications rely on time-scheduled frames through tree-topology fibre networks, incapable assuring guaranteed connections low or stable latency, which is necessary for, e.g. remote surgeries safe operations self-driven cars. Besides, their scalability...

We analyse the performance limits of dual frequency comb based photonic signal processors. show that relative phase noise between two combs is critical to defining signal-to-noise-ratio such systems.