Discretely tunable optical delay lines using serial and step‐chirped sidewall Bragg gratings in SOI

Spasojevic, Mina; Chen, Lawrence R.

doi:10.1049/el.2013.0840

Cited by 20 publications

(16 citation statements)

References 9 publications

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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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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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“…A continuously tunable delay line using linearly chirped Bragg gratings was recently demonstrated in micrometer-scale SOI waveguides. 44 Realization of nanophotonic Bragg-grating devices is important for their applications in large-scale integrated photonic systems, 8,9,45 since most CMOS-compatible active devices, such as high-speed optical modulators and detectors, are developed on submicron SOI wafers. 46 Tunable delay lines on submicron silicon were recently demonstrated using PS gratings 38 and serial/step-chirped gratings, 45 where the delay was tuned by changing laser wavelength.…”

Section: Integrated Tunable Optical Delay Linesmentioning

confidence: 99%

“…The group delay was measured by characterizing the waveforms generated by an external modulator with non-return-to-zero (NRZ) signals operating at 10 Gb/s, similar to the method used in. 40,45 The passband is 9.5-nm wide. The excess loss near the band edge at the short-wavelength side (1558 nm) is less than 2 dB, corresponding to the total loss though a round trip (7.44 mm) of the entire coupler, from which a propagation loss of 2.7 dB/cm is extracted.…”

Section: Integrated Tunable Optical Delay Linesmentioning

confidence: 99%

Silicon photonic Bragg-grating couplers for optical communications

et al. 2014

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We discuss recent progress and challenges in realizing Bragg-grating devices on the submicron silicon-on-insulator platform for next-generation optical communications applications, such as on-chip optical interconnects and signal processing. In particular, we focus on grating-assisted, wavelength-selective couplers, known as contra-directional couplers (contra-DCs). In contrast to conventional two-port Bragg gratings operating in the reflection mode, contra-DCs are four-port devices with very weak backreflections and, therefore, can be easily integrated with other photonic components on a chip. In order to provide a reliable on-chip wavelength-division multiplexing (WDM) solution for high-speed optical interconnects, we have developed high-performance add-drop filters and, furthermore, wavelength multiplexers/demultiplexers with combined advantages of flat-top responses, low insertion loss (< 1 dB), and low crosstalk (< -23 dB). These WDM devices are ultra-compact and highly tolerant to temperature fluctuations (up to ± 50 0 C), showing great potential for large-scale integration and low-power consumption. We further discuss a novel four-port Bragg photonic resonator for high-speed, low-power optical switching. Using a coupler-chirped design with uniform Bragg gratings, we have recently achieved an on-chip, continuously tunable photonic delay line with low insertion loss. These system-orientated devices indicate great potential for large-scale integration of Bragg-grating-defined functions using CMOS-compatible silicon photonics technology.

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“…A continuously tunable delay line using linearly chirped Bragg gratings was recently demonstrated in micrometer-scale SOI waveguides [7]. Realization of nanophotonic Bragg-grating devices is important for their applications in large-scale integrated photonic circuits [8][9][10], because most CMOS-compatible active components, such as high-speed optical modulators and detectors, are developed on nanometer-scale (e.g., 220 nm) SOI wafers [11].…”

mentioning

confidence: 99%

“…This leads to compact devices but also makes the fine tuning of grating pitches challenging. While discrete delay tuning can be obtained by stepped pitch variation [10], it is easier to taper waveguide widths for continuous tuning [7]. The use of uniform gratings ensures that lithography effects are constant throughout the coupler, and thus can be more precisely predicted [13].…”

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confidence: 99%

Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

et al. 2014

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We demonstrate an integrated tunable optical delay line in grating-assisted contradirectional couplers using a CMOS-compatible photonic technology. The input signal is delayed through dispersive Bragg gratings and distributedly coupled to the drop port of the coupler without backreflections. This add-drop design enables monolithic integration of grating-based delay lines without using optical circulators. The gratings are formed by slab perturbations in rib waveguides, with the index chirping realized by linearly tapering the rib widths. Both the pitch and size of the gratings are constant through the entire coupler, for a higher tolerance to fabrication errors. Continuous tuning of the optical group delay of up to 96 ps has been obtained, with a low insertion loss of less than 2 dB and a negative chromatic dispersion of -11 ps/nm that allows for bit rates of up to almost 100 Gb/s at the maximal delay. The device has a small footprint of 0.015 mm2, and can be used for on-chip optical buffering, dispersion compensation, and pulse compression.

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Discretely tunable optical delay lines using serial and step‐chirped sidewall Bragg gratings in SOI

Abstract: Discretely tunable optical delay lines using serial and step-chirped sidewall Bragg gratings in SOI are demonstrated. Delays of up to 60 ps (28 ps) in steps of 20 ps (14 ps) spanning bandwidths of 53 nm (33 nm) are obtained for serial (step-chirped) gratings.

Cited by 20 publications

References 9 publications

Simultaneous Multi-Channel Microwave Photonic Signal Processing

Simultaneous Multi-Channel Microwave Photonic Signal Processing

Silicon photonic Bragg-grating couplers for optical communications

Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

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