Integrated Bragg Grating Filter With Reflection Light Dropped via Two Mode Conversions

Xiao, Rulei; Shi, Yuechun; Li, Jia; Dai, Pan; Ma, Chunliang; Chen, Min; Zhao, Yong; Chen, Xiangfei

doi:10.1109/jlt.2019.2896094

Cited by 15 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By implementing the phase-only filter using WBGs designed in a spiral geometry 62 , several orders of magnitude reduction in the overall device footprint, i.e., from few cm 2 to sub-mm 2 , could be realized. Towards circulator-free operation of reflective devices, a myriad of alternative solutions have been proposed to collect the reflected signal from Bragg gratings, such as contra-directional couplers 63 , asymmetric Y-splitters 64 , mode-converters assisted coupling elements 65 , etc. We anticipate that such coupling elements could be employed to cascade multiple WBG-based spectral phase filters to realize sophisticated logic operations.…”

Section: Discussionmentioning

confidence: 99%

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

et al. 2023

View full text Add to dashboard Cite

Photonic-based implementation of advanced computing tasks is a potential alternative to mitigate the bandwidth limitations of electronics. Despite the inherent advantage of a large bandwidth, photonic systems are generally bulky and power-hungry. In this respect, all-pass spectral phase filters enable simultaneous ultrahigh speed operation and minimal power consumption for a wide range of signal processing functionalities. Yet, phase filters offering GHz to sub-GHz frequency resolution in practical, integrated platforms have remained elusive. We report a fibre Bragg grating-based phase filter with a record frequency resolution of 1 GHz, at least 10× improvement compared to a conventional optical waveshaper. The all-fibre phase filter is employed to experimentally realize high-speed fully passive NOT and XNOR logic operations. We demonstrate inversion of a 45-Gbps 127-bit random sequence with an energy consumption of ~34 fJ/bit, and XNOR logic at a bit rate of 10.25 Gbps consuming ~425 fJ/bit. The scalable implementation of phase filters provides a promising path towards widespread deployment of compact, low-energy-consuming signal processors.

show abstract

Section: Discussionmentioning

confidence: 99%

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

et al. 2023

View full text Add to dashboard Cite

show abstract

“…After passing through the ADC, the backward TE 1 mode is converted into TE 0 mode and guided into the lower branch waveguide, which is connected to the drop port. The ADC-based mode de-multiplexer can significantly reduce the reflections back to the input port while exhibiting a high fabrication error tolerance [30]. The light with wavelengths away from the Bragg wavelength will travel through the Bragg grating to the through port.…”

Section: Methodsmentioning

confidence: 99%

“…A minor random phase difference between the grating pairs would invalidate the drop filter [26]. Several other solutions have been applied to Bragg gratings without chirp to realize a drop function, such as grating-assisted contradirectional coupler [27], Mach-Zehnder interferometer structure [28], asymmetric Y-branch [29] and adiabatic directional coupler (ADC) [15,30]. But until now, few of them have been used in integrated chirped Bragg gratings.…”

Section: Introductionmentioning

confidence: 99%

Mode-Conversion-Based Chirped Bragg Gratings on Thin-Film Lithium Niobate

Huang

Yin

et al. 2022

Photonics

View full text Add to dashboard Cite

In this work, we propose a mode-conversion-based chirped Bragg grating on thin-film lithium niobate (TFLN). The device is mainly composed of a 4.7-mm long chirped asymmetric Bragg grating and an adiabatic directional coupler (ADC). The mode conversion introduced by the ADC allows the chirped Bragg grating operates in reflection without using an off-chip circulator. The proposed device has experimentally achieved a total time delay of 73.4 ps over an operating bandwidth of 15 nm. This mode-conversion-based chirped Bragg grating shows excellent compatibility with other devices on TFLN, making it suitable in monolithically integrated microwave photonics, sensing, and optical communication systems.

show abstract

“…RAGG gratings have developed extensive applications in optical devices for communication [1]- [3], sensing [4], [5], signal processing [6]- [9], etc. In recent years, the development of integrated on-chip Bragg gratings has become an inevitable trend, and tremendous amount of researches on waveguide Bragg gratings has emerged [10]- [12]. Nowadays, the requirement for long length Bragg gratings with chirp has become increasingly urgent in fields such as dispersion compensation [13], [14] and frequencytime mapping [15]- [18].…”

Section: Introductionmentioning

confidence: 99%

Large Group Delay in Silicon-on-Insulator Chirped Spiral Bragg Grating Waveguide

et al. 2021

View full text Add to dashboard Cite

Limited by large transmission loss, the development of transverse electric (TE) mode silicon-oninsulator (SOI) based on-chip long length chirped grating waveguide faces many difficulties now. To overcome this problem, multi-mode waveguide with a measured transmission loss of 0.7 dB/cm is applied in this paper, and a chirped spiral Bragg grating waveguide (SBGW) is proposed and experimentally demonstrated. The length of the chirped SBGW reaches 2.7 cm, which is the longest SOI based grating reported so far. The total group delay is measured to be 628 ps, with a structure size of only 0.3 mm 2 due to the application of spiral configuration. The slope of the linear dispersion is -27.7 ps/nm. This integrated chirped SBGW shows great compatibility with frequently used TE mode SOI devices and has great potential for applications in microwave photonics requiring dispersion control.

show abstract

Integrated Bragg Grating Filter With Reflection Light Dropped via Two Mode Conversions

Cited by 15 publications

References 27 publications

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

Mode-Conversion-Based Chirped Bragg Gratings on Thin-Film Lithium Niobate

Large Group Delay in Silicon-on-Insulator Chirped Spiral Bragg Grating Waveguide

Contact Info

Product

Resources

About