Analysis of Negative Group Delay Response of All-Pass Ring Resonator With Mach–Zehnder Interferometer

Takahashi, H.; Carlsson, Patrick; Nishimura, K.; Usami, M.

doi:10.1109/lpt.2004.832603

Cited by 25 publications

(19 citation statements)

References 6 publications

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“…1, can also exhibit "fast" light with negative v g phenomenon when operated in an undercoupled condition. Negative group velocity in TPRR has also been studied for telecommunication applications [15], [16]. However, distortions and losses (see discussions in Section IV), which accompany such a phenomenon, together with the fact that no true signal "advancement" can be expected as v g is no longer the signal velocity [12] in such a phenomenon, could hinder its further exploitation.…”

Section: Modeling Of Loss-induced Superluminal Andmentioning

confidence: 99%

Modeling of Loss-Induced Superluminal and Negative Group Velocity in Two-Port Ring-Resonator Circuits

Uranus

Hoekstra

2007

J. Lightwave Technol.

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Abstract-The group velocity v g of light in two-port ringresonator (TPRR) circuits with loss is theoretically studied. We point out four possible operation regimes, i.e., "slow" light with positive v g , "slow" light with negative v g , "fast" light with negative v g , and "fast" light with positive v g , where "slow" means |v g | < c and "fast" means |v g | > c, with c denoting the velocity of light in vacuum. The temporal behavior of pulses passing through the TPRR for the four operation regimes and the potential of "slow" light TPRR either with positive or negative v g for sensing applications are also discussed.

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Section: Modeling Of Loss-induced Superluminal Andmentioning

confidence: 99%

Modeling of Loss-Induced Superluminal and Negative Group Velocity in Two-Port Ring-Resonator Circuits

Uranus

Hoekstra

2007

J. Lightwave Technol.

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“…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.…”

mentioning

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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“…Bandpass filtering is achieved with a 3 dB bandwidth of 0.66 nm and an in-band ripple of less than 1 dB when the two resonances are detuned, while the filter can function as an optical buffer with an insertion loss of 5.85 dB and a predicted time delay of 15 ps when the two resonances are approximately aligned. Furthermore, the influence of resonance spacing is analyzed on the performance of this filter.Bandpass filters [1][2][3][4][5][6][7], all-pass filters [8], and notch filters [9,10] are universally required in optical communications for filtering and buffering applications. A box-like filter is an ideal bandpass filter with a flat-top passband and a sharp roll-off, accommodating large channel counts.…”

mentioning

confidence: 99%

“…Bandpass filters [1][2][3][4][5][6][7], all-pass filters [8], and notch filters [9,10] are universally required in optical communications for filtering and buffering applications. A box-like filter is an ideal bandpass filter with a flat-top passband and a sharp roll-off, accommodating large channel counts.…”

mentioning

confidence: 99%

“…Recent studies indicate that asymmetric bandpass filters [6,7] may offer higher channel packing density than the symmetric counterparts because of the pronounced out-of-band rejection level. On the other hand, the all-pass filter [8] is an excellent optical buffer with very low loss and a large resonant group delay, due to the strong phase variation at resonance and unity transmission over the whole resonance bandwidth. In addition, notch filters [9,10] based on over-coupled resonators also can function as delay lines, though the power loss of the delayed signals is relatively high.…”

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confidence: 99%

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Experimental demonstration of a microdisk resonator filter/buffer utilizing two-mode interference

et al. 2014

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We have experimentally demonstrated a microdisk-resonator (MDR)-based filter for filtering and buffering applications utilizing two-mode interference. Optical filtering or buffering behavior can be generated by the coherent interference between two orthogonal whispering-gallery modes (WGMs) in a MDR symmetrically coupled to two bus waveguides. MDRs were fabricated using nanofabrication processes on a silicon-on-insulator platform. Multiple resonances of WGMs are excited in a MDR and unique filter characteristics have been observed for two spectrally nearby resonances. The measured results agree well with the theoretical simulation. Bandpass filtering is achieved with a 3 dB bandwidth of 0.66 nm and an in-band ripple of less than 1 dB when the two resonances are detuned, while the filter can function as an optical buffer with an insertion loss of 5.85 dB and a predicted time delay of 15 ps when the two resonances are approximately aligned. Furthermore, the influence of resonance spacing is analyzed on the performance of this filter.

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Analysis of Negative Group Delay Response of All-Pass Ring Resonator With Mach–Zehnder Interferometer

Cited by 25 publications

References 6 publications

Modeling of Loss-Induced Superluminal and Negative Group Velocity in Two-Port Ring-Resonator Circuits

Modeling of Loss-Induced Superluminal and Negative Group Velocity in Two-Port Ring-Resonator Circuits

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

Experimental demonstration of a microdisk resonator filter/buffer utilizing two-mode interference

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