Q-band oscillator at 49GHz for broadband photonic microwave frequency conversion based on a Kerr soliton crystal micro-comb

We report a broadband microwave frequency converter based on a coherent Kerr optical micro-comb generated by an integrated micro-ring resonator. The coherent micro-comb displays features that are consistent with soliton crystal dynamics with an FSR of 48.9-GHz. We use this to demonstrate a high-performance millimeter-wave local oscillator at 48.9-GHz in the Q-band for microwave frequency conversion. We experimentally verify the microwave performance up to 40 GHz, achieving a ratio of −6.8 dB between output RF power and IF power and a spurious suppression ratio of > 43.5 dB. The experimental results show good agreement with theory and verify the effectiveness of microwave frequency converters based on coherent optical micro-combs, with the ability to achieve reduced size, complexity, and potential cost.

Towards 5G millimeter-wave wireless networks: a comparative study on electro-optical upconversion techniques

<span>Fifth−generation (5G) wireless networks that use the MM−W hold a great promise to revolutionize wireless industry. However, the difficulty in generating and transmitting these high‐frequency signals in the electrical−domain due to bandwidth limitation of electronic components, and high absorption loss limits current applications. Consequently, optical generation and transmission of MM−W signals are a viable option. In this paper, a comparative study is carried out on three electro−optical upconversion (EOU) techniques to generate 60−GHz MM−W signal, namely 4−tupling, 6−tupling and 8−tupling. The paper briefly describes the three techniques and analyses the optical harmonic distortion suppression ratio (OHDSR) and electrical spurious suppression ratio (ESSR) generated by each one of the techniques. OHDSR and ESSR have been compared to show the trade-off between the techniques. In addition, the paper compares the implementation of non−ideal phase shifting on OHDSR for the three EOU techniques Finally, the performance of the three EOU techniques after transmission over optical fiber is evaluated by quality factor (Q−factor) and eye pattern test. The results of the simulation illustrate well the benefits of the performed study and confirm that the 4−tupling constitutes a cost−effective technique to generate MM−W signals.</span>

ANZCOP ACOFT SPIE Melbourne 2019 GO FWM Waveguides

A broadband microwave mixer is demonstrated based on an integrated optical micro-comb source, with an operation bandwidth up to over 60 GHz, a conversion efficiency of −6.8 dB and a spurious suppression ratio of over 43.5 dB, and experimentally verify the RF performance up to 40 GHz. This approach to realizing microwave mixers offers reduced complexity, size, and potential cost for a wide range of applications to microwave systems.

ACOFT ANZCOP SPIE Melb 2019 RF frequency converter

A broadband microwave mixer is demonstrated based on an integrated optical micro-comb source, with an operationbandwidth up to over 60 GHz, a conversion efficiency of −6.8 dB and a spurious suppression ratio of over 43.5 dB, andexperimentally verify the RF performance up to 40 GHz. This approach to realizing microwave mixers offers reducedcomplexity, size, and potential cost for a wide range of applications to microwave systems.

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Purpose This paper aims to design a dual mode X-band substrate integrated waveguide (SIW) bandpass filter in the conventional SIW structure. A pair of back-to-back square and split ring resonator is introduced in the single-layer SIW bandpass filter. The various coupling configurations of SIW bandpass filter using split square ring slot resonator is designed to obtain dual resonant mode in the passband. It is shown that the measured results agree with the simulated results to meet compact size, lower the transmission coefficient, better reflection coefficient, sharp sideband rejection and minimal group delay. Design/methodology/approach A spurious suppression of wideband response is suppressed using an open stub in the transmission line. The width and length of the stub are tuned to suppress the wideband spurs in the stopband. The measured 3 dB bandwidth is from 8.76 to 14.24 GHz with a fractional bandwidth of 48.04% at a center frequency of 11.63 GHz, 12.59 GHz. The structure is analyzed using the equivalent circuit model, and the simulated analysis is based on an advanced design system software. Findings This paper discusses the characteristics of resonator below the waveguide cut-off frequency with their working principles and applications. Considering the difficulties in combining the resonators with a metallic waveguide, a new guided wave structure – the SIW is designed, which is synthesized on a planar substrate with linear periodic arrays of metallized via based on the printed circuit board. Originality/value This study has investigated the wave propagation problem of the SIW loaded by square ring slot-loaded resonator. The electric dipole nature of the resonator has been used to achieve a forward passband in a waveguide environment. The proposed filters have numerous advantages such as high-quality factor, low insertion loss, easy to integrate with the other planar circuits and, most importantly, compact size.

microwave frequency converter

We report a broadband microwave frequency converterbased on a coherent Kerr optical micro-comb generatedby an integrated micro-ring resonator. The coherent micro-combdisplays features that are consistent with soliton crystal dynamicswith a free spectral range of 48.9 GHz.We use this to demonstratea high-performancemillimeter-wave local oscillator for microwavefrequency conversion. We experimentally verify the microwaveperformance up to 40 GHz, achieving a ratio of −6.8 dB betweenoutput radio frequency power and intermediate frequency powerand a spurious suppression ratio of &gt;43.5 dB. The experimentalresults show good agreement with theory and verify the effectivenessof microwave frequency converters based on coherent opticalmicro-combs, with the ability to achieve reduced size, complexity,and potential cost.