Wideband Integrated Optical Delay Line Based on a Continuously Tunable Mach–Zehnder Interferometer

Melati, Daniele; Waqas, Abi; Mushtaq, Zarlish; Melloni, Andrea

doi:10.1109/jstqe.2017.2723955

Cited by 32 publications

(9 citation statements)

References 23 publications

(28 reference statements)

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“…If H(ω) is the transfer function of the 1MZDL in bar state and τ = ∂( H)/∂ω the corresponding group delay (with H the phase of H), the normalized group delay can be written as [13]…”

Section: Mach-zehnder-based Delay Linesmentioning

confidence: 99%

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Cascaded Mach–Zehnder Architectures for Photonic Integrated Delay Lines

Waqas

Melati

Melloni

2018

IEEE Photon. Technol. Lett.

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A continuously tunable integrated optical delay line architecture with large bandwidth and bandwidth-delay product is proposed and demonstrated. The non-resonant delay line is based on cascaded Mach-Zehnder interferometers with tunable couplers. The device is operated with a single control signal and outperform the common ring-resonator-based delay lines in terms of bandwidth-delay product. A device with a delay tuning range of 124 ps is experimentally demonstrated over a transmission bandwidth of 4.5 GHz.

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“…If H(ω) is the transfer function of the 1MZDL in bar state and τ = ∂( H)/∂ω the corresponding group delay (with H the phase of H), the normalized group delay can be written as [13]…”

Section: Mach-zehnder-based Delay Linesmentioning

confidence: 99%

“…Recently, we have proposed a non-resonant Mach-Zehnderbased integrated optical delay line that is continuously tunable with a large bandwidth-delay product and a very low chromatic dispersion [13]. Two tunable couplers allow the full tunability of the dealy.…”

Section: Introductionmentioning

confidence: 99%

Cascaded Mach–Zehnder Architectures for Photonic Integrated Delay Lines

Waqas

Melati

Melloni

2018

IEEE Photon. Technol. Lett.

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“…It should be noted that a considerable delay of 627 ps can be achieved in the over-coupling condition while maintaining the optical loss less than 25 dB. Optical delay lines can also be realized via adopting a series of Mach Zehnder Interferometer (MZI) or microring resonator-based optical switches, thus generating a tunable time delay controlled by the optical path change [45][46][47][48]. In [48], for example, a delay element based on microring resonators in combination with graphene-based Mach-Zehnder interferometer switches is reported on a silicon nitride platform, demonstrating an optical delay up to 920 ps with optical loss less than 27 dB.…”

Section: Integrated Mwp Delay Linementioning

confidence: 99%

Integrated Microwave Photonics for Wideband Signal Processing

Chew

Song

et al. 2017

Photonics

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Abstract:We describe recent progress in integrated microwave photonics in wideband signal processing applications with a focus on the key signal processing building blocks, the realization of monolithic integration, and cascaded photonic signal processing for analog radio frequency (RF) photonic links. New developments in integration-based microwave photonic techniques, that have high potentialities to be used in a variety of sensing applications for enhanced resolution and speed are also presented.

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“…Optical delay lines (ODLs) are key components in many applications, such as optical signal processing and buffering in optical networks, beamforming and filtering in microwave photonic systems, biomedical sensing, and 3D light detection and ranging (LiDAR) [1][2][3][4][5][6]. Tunable optical true-time delay lines allow flexible control of the propagation delay of an optical signal.…”

Section: Introductionmentioning

confidence: 99%

“…Contour plot of (a) wavelength and (b) maximum group delay as a function of input power of heaters. (a) Group delay as a function of the wavelength for [(H2, H1) = (0, 5),(2,4), (4, 3), (6, 2), (8, 1)] mW, where H1 and H2 indicate the power to Heater 1 and 2, respectively. (b) Peak group delay, power transmission, and wavelength as a function of the input power of Heater 2. and 10 show that the group delay can be tuned over one free spectral range (FSR) by using <30 mW of the Heater 1 power when the input power of Heater 2 is 0 to 8 mW for different group delays.…”

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confidence: 99%

Tunable Optical Delay Line Based on a Racetrack Resonator with Tunable Coupling and Stable Wavelength

Hailu

Lee

2019

Applied Sciences

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For optical sensing or biomedical sensing where the light source usually has a stable and narrow linewidth, the design rule of the tunable optical delay line (ODL) can be different from the ODLs for optical communications and buffering. We present here a novel way to tune a racetrack resonator-based ODL by push-pull operation to stabilize the resonant wavelength. Full device simulation that accounts for the thermal tuning effect and the photonic characteristics of the whole integrated device is conducted to verify the characteristics of the tunable ODLs. With the simple racetrack resonator, the group delay can simply be tuned by changing the coupling coefficient of the resonator while the wavelength is stabilized by tuning the racetrack loop. A tuning of hundreds of picoseconds is achievable with a very compact device and small power consumption.Many different integration platforms can be utilized to make ODLs. Basic trade-offs between the integration density and waveguide propagation loss need to be considered before choosing the proper platform. The silicon photonics platform based on the silicon-on-insulator (SOI) is regarded as one of the most promising technologies for large-scale high-density photonic integration because of its large index contrast, small bending radius, and use of compatible fabrication facilities in semiconductor foundries [5,17]. Currently, there are several semiconductor foundries and research institutes providing the multi-project-wafer (MPW) process for SOI-based photonic integration, which can reduce the research and development cost for realizing tunable ODLs. Therefore, our design is based on the SOI platform.There are two commonly used approaches to tune the SOI-based ODLs: Tuning with thermal heating or carrier-induced effects. Both tuning mechanisms change the refractive index of the waveguide and then change the phase. However, the carrier-induced effect via carrier injection or depletion requires the formation of a PN junction in the waveguide, and the refractive index change is associated with a loss change. Therefore, thermal tuning is usually the choice for its simple device structure and low optical loss as long as the tuning speed is not the major concern. In fact, the thermal tuning speed can be as short as a few µs for the local heating of a compact SOI waveguide [20]. The high thermal resistance of the silica cladding on a SOI structure can also reduce the thermal crosstalk and power consumption.Tunable ODLs based on ring resonators have been demonstrated by several groups [21][22][23][24][25]. Most of the designs are for optical signal processing or buffering. In these applications, the critical requirements include a large enough true delay, wide bandwidth, and low higher-order phase variations that will lead to dispersion and signal distortions. Therefore, multiple stages of ring resonators are employed to achieve the desired delay with large bandwidth and low distortion [4]. However, the manufacturing variations in the associated multiple rings will result in fluct...

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Wideband Integrated Optical Delay Line Based on a Continuously Tunable Mach–Zehnder Interferometer

Cited by 32 publications

References 23 publications

Cascaded Mach–Zehnder Architectures for Photonic Integrated Delay Lines

Cascaded Mach–Zehnder Architectures for Photonic Integrated Delay Lines

Integrated Microwave Photonics for Wideband Signal Processing

Tunable Optical Delay Line Based on a Racetrack Resonator with Tunable Coupling and Stable Wavelength

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