Chirped Microwave Pulse Generation Using an Integrated SiP Bragg Grating in a Sagnac Loop

Wang, Junjia; Ashrafi, Reza; Rochette, Martin; Chen, Lawrence R.

doi:10.1109/lpt.2015.2444275

Cited by 21 publications

(11 citation statements)

References 16 publications

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“…By incorporating a chirped waveguide Bragg grating in a Sagnac loop (an integrated version of the scheme shown in Fig. 5), a spectral shaper with an increasing or decreasing FSR can be implemented [42]. By using the spectral shaper, a chirped microwave waveform can be generated based on FTT mapping.…”

Section: Integrated On-chip Spectral Shaper [33]-[44]mentioning

confidence: 99%

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Photonic Generation of Wideband Chirped Microwave Waveforms

2021

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A chirped microwave waveform with a large time-bandwidth product (TBWP) can find important applications in modern radar systems and microwave imaging systems. Microwave photonics, a field that studies the generation and processing of microwave signals in the optical domain to take advantage of the ultra-wide bandwidth offered by photonics, has been considered an effective solution for high-frequency and large-bandwidth microwave waveform generation. In this paper, an overview on photonic generation of wideband chirped microwave waveforms is provided. Three major methods are discussed including chirped microwave waveform generation based on spectral shaping and frequency-to-time (SS-FTT) mapping, frequency and bandwidth multiplication, and Fourier-domain mode-locking of an optoelectronic oscillator (OEO). The performance of the techniques for chirped microwave waveform generation is studied. Techniques to generate chirped microwave waveforms based on photonic integrated circuits (PICs) are also discussed.INDEX TERMS Microwave photonics, chirped microwave waveform, arbitrary waveform generation, time bandwidth product, optoelectronic oscillator.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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Section: Integrated On-chip Spectral Shaper [33]-[44]mentioning

confidence: 99%

“…By using the spectral shaper, a chirped microwave waveform can be generated based on FTT mapping. In the demonstration reported in [42], for a chirped Bragg grating with a length of 3.2 mm and a chirp rate of 0.26 nm/mm, a chirped microwave waveform with a TBWP of around 15 was generated.…”

Section: Integrated On-chip Spectral Shaper [33]-[44]mentioning

confidence: 99%

Photonic Generation of Wideband Chirped Microwave Waveforms

2021

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“…For any other purposes, permission must be obtained from the IEEE by emailing pubs-permissions@ieee.org. We have implemented the Sagnac loop based spectral shaper in SOI using the same platform and fabrication processes as with the on-chip DFPCs [30]. As before, we use nanowire waveguides with a cross-section of h  W = 220 nm  500 nm.…”

Section: Sagnac Loopmentioning

confidence: 99%

Silicon Photonics for Microwave Photonics Applications

Chen

2017

J. Lightwave Technol.

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We provide an overview of recent work on developing integrated microwave photonic subsystems in silicon photonics for generating chirped microwave waveforms as well as for providing optical true time delay. First, we describe onchip spectral shapers based on Bragg gratings (BGs), including a distributed Fabry-Pérot cavity, a Michelson interferometer incorporating identical chirped BGs, and a Sagnac loop incorporating a chirped BGs, for use in wavelength-to-time mapping systems. The performance of these on-chip spectral shapers is compared to those based on microring resonators as well as fiber or free-space configurations. Second, we consider the development of an index variable optical true time delay line (OTTDL) using subwavelength grating (SWG) waveguides. For SWG waveguides of the same length, incremental delays can be obtained by tailoring the group index via control over the duty cycle. We compare the performance of SWG waveguide OTTDLs to other length variable implementations in silicon.

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“…Spectral shapers in both fiber and integrated forms that provide an aperiodic response (i.e., variable FSR) have been considered, including a serial array of BGs (sometimes referred to as a spatially discrete chirped BG or a step-chirped BG) [22,23], a Fabry-Pérot cavity with distributed resonances based on spatially separate or overlapping (either fully or partially) linearly chirped BGs [24,25], a Michelson interferometer incorporating linearly chirped BGs in each arm [26,27], or a Sagnac interferometer incorporating a single linearly chirped BG [28,29]. The Sagnac configuration, illustrated in Figure 2a, provides the same functionality as the Michelson interferometer incorporating two identical and oppositely chirped BGs.…”

Section: Photonic Generation Of Chirped Microwave Waveforms Using Supmentioning

confidence: 99%

Simultaneous Multi-Channel Microwave Photonic Signal Processing

Chen

Moslemi

et al. 2017

Photonics

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Microwave photonic (MWP) systems exploit the advantages of photonics, especially with regards to ultrabroad bandwidth and adaptability, features that are significantly more challenging to obtain in the electronic domain. Thus, MWP systems can be used to realize a number of microwave signal processing functions including, amongst others, waveform generation and radio-frequency spectrum analysis (RFSA). In this paper, we review recent results on fiber and integrated approaches for simultaneous generation of multiple chirped microwave waveforms as well as multi-channel RFSA of ultrahigh repetition optical rate pulse trains.

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Chirped Microwave Pulse Generation Using an Integrated SiP Bragg Grating in a Sagnac Loop

Cited by 21 publications

References 16 publications

Photonic Generation of Wideband Chirped Microwave Waveforms

Photonic Generation of Wideband Chirped Microwave Waveforms

Silicon Photonics for Microwave Photonics Applications

Simultaneous Multi-Channel Microwave Photonic Signal Processing

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