All-optical tunable delay line based on nonlinearities in a chalcogenide microfiber coil resonator

Kowsari, A.; Ahmadi, Vahid; Darvish, Ghafar; Moravvej-Farshi, Mohammad Kazem

doi:10.1364/josab.34.001199

Cited by 4 publications

(7 citation statements)

References 36 publications

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“…In addition to the parameters presented in Table 1, we calculate the first‐order dispersion coefficient

β_{1} = false(1 / L false) false(d φ_{normalT} / d ω false)

, where L is the length of the MNF, φ T is the phase of the transmission coefficient, and ω is the angular frequency. We also calculate the second‐order dispersion coefficient

β_{2} = false(1 / L false) false({normald}^{2} φ_{normalT} / d ω^{2} false)

, [13]. We use a pump/probe configuration to show the functionality of the switch.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…For dynamic analysis with time‐varying inputs, (1) should be modified according to simplified NLSE. For pulses of width larger than 5 ps, the self‐steepening and Raman scattering can be ignored, therefore in the presence of probe and pump, the coupled NLSE can be written as [9, 13]

({, \begin{matrix} \frac{normal∂ A_{1}}{normal∂ z} = - \frac{α}{2} A_{1} - β_{1} \frac{normal∂ A_{1}}{normal∂ t} - i \frac{β_{2}}{2} \frac{\partial^{2} A_{1}}{normal∂ t^{2}} + i κ A_{2} + i γ ({(||, A_{1})}^{2} + 2 | B_{1} {falsefalse|}^{2}) A_{1} \\ \frac{normal∂ A_{2}}{normal∂ z} = - \frac{α}{2} A_{2} - β_{1} \frac{normal∂ A_{2}}{normal∂ t} - i \frac{β_{2}}{2} \frac{\partial^{2} A_{2}}{normal∂ t^{2}} + i κ A_{1} + i γ ({(||, A_{2})}^{2} + 2 | B_{2} {falsefalse|}^{2}) A_{2} \end{matrix})

where A 1,2 and B 1,2 represent time‐varying envelopes of probe and pump, respectively, β 1 and β 2 are the first and second dispersion orders in which β 2 is the cause of the group velocity dispersion.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…For dynamic analysis with time-varying inputs, (1) should be modified according to simplified NLSE. For pulses of width larger than 5 ps, the self-steepening and Raman scattering can be ignored, therefore in the presence of probe and pump, the coupled NLSE can be written as [9,13] ∂A…”

mentioning

confidence: 99%

“…where L is the length of the MNF, w T is the phase of the transmission coefficient, and ω is the angular frequency. We also calculate the second-order dispersion coefficient b [13]. We use a pump/probe configuration to show the functionality of the switch.…”

mentioning

confidence: 99%

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Resonantly enhanced all‐optical switching in microfibre Mach–Zehnder interferometers

Kowsari

Saghaei

2018

Electron. lett.

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We propose an all-optical switch based on a microfibre Mach-Zehnder interferometer (MMZI) in which the MMZI is considered with a microfibre loop resonator (MLR) in one arm of it. The authors numerically demonstrate that the enhanced phase shift of the MLR near its resonance wavelengths can be used for constructive/destructive interference and switching functionality of the MMZI. The calculated switching threshold power of the switch is about 2 mW, which can be further reduced by the use of an MLR with more finesse, and the rising and falling times are computed with 21 and 91 ps, respectively. Natural connection to silica single mode fibres, easy configuration and high speed make it as a suitable choice for all-optical signal processing and communications applications.

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“…In addition to the parameters presented in Table 1, we calculate the first‐order dispersion coefficient

β_{1} = false(1 / L false) false(d φ_{normalT} / d ω false)

, where L is the length of the MNF, φ T is the phase of the transmission coefficient, and ω is the angular frequency. We also calculate the second‐order dispersion coefficient

β_{2} = false(1 / L false) false({normald}^{2} φ_{normalT} / d ω^{2} false)

, [13]. We use a pump/probe configuration to show the functionality of the switch.…”

Section: Simulation Resultsmentioning

confidence: 99%

({, \begin{matrix} \frac{normal∂ A_{1}}{normal∂ z} = - \frac{α}{2} A_{1} - β_{1} \frac{normal∂ A_{1}}{normal∂ t} - i \frac{β_{2}}{2} \frac{\partial^{2} A_{1}}{normal∂ t^{2}} + i κ A_{2} + i γ ({(||, A_{1})}^{2} + 2 | B_{1} {falsefalse|}^{2}) A_{1} \\ \frac{normal∂ A_{2}}{normal∂ z} = - \frac{α}{2} A_{2} - β_{1} \frac{normal∂ A_{2}}{normal∂ t} - i \frac{β_{2}}{2} \frac{\partial^{2} A_{2}}{normal∂ t^{2}} + i κ A_{1} + i γ ({(||, A_{2})}^{2} + 2 | B_{2} {falsefalse|}^{2}) A_{2} \end{matrix})

Section: Theoretical Backgroundmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Resonantly enhanced all‐optical switching in microfibre Mach–Zehnder interferometers

Kowsari

Saghaei

2018

Electron. lett.

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“…One method is based on the electromagnetically induced transparency (EIT) in a vapor or a solid at, in most cases, cryogenic temperatures (Figure 1A) [22]. In addition, the optical nonlinear effect [23][24][25] can induce gain or loss at a certain frequency range. For example, the stimulated Brillouin scattering (SBS) [21],…”

Section: Basic Theory Of Slow-light Effectmentioning

confidence: 99%

Recent Progress in Silicon-Based Slow-Light Electro-Optic Modulators

et al. 2022

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As an important optoelectronic integration platform, silicon photonics has achieved significant progress in recent years, demonstrating the advantages on low power consumption, low cost, and complementary metal–oxide–semiconductor (CMOS) compatibility. Among the different silicon photonics devices, the silicon electro-optic modulator is a key active component to implement the conversion of electric signal to optical signal. However, conventional silicon Mach–Zehnder modulators and silicon micro-ring modulators both have their own limitations, which will limit their use in future systems. For example, the conventional silicon Mach–Zehnder modulators are hindered by large footprint, while the silicon micro-ring modulators have narrow optical bandwidth and high temperature sensitivity. Therefore, developing a new structure for silicon modulators to improve the performance is a crucial research direction in silicon photonics. Meanwhile, slow-light effect is an important physical phenomenon that can reduce the group velocity of light. Applying slow-light effect on silicon modulators through photonics crystal and waveguide grating structures is an attractive research point, especially in the aspect of reducing the device footprint. In this paper, we review the recent progress of silicon-based slow-light electro-optic modulators towards future communication requirements. Beginning from the principle of slow-light effect, we summarize the research of silicon photonic crystal modulators and silicon waveguide grating modulators in detail. Simultaneously, the experimental results of representative silicon slow-light modulators are compared and analyzed. Finally, we discuss the existing challenges and development directions of silicon-based slow-light electro-optic modulators for the practical applications.

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Optimizing contact area geometry and taper composition in microknot resonators

Blank

Linzon

2019

Journal of Applied Physics

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We performed a comprehensive numerical study of the photonic transmission in manually prepared microknot resonators with different contact coupling area geometries and refractive index variations. A quantitative comparison between historical and state-of-the-art quality-factor values achieved in microring, microloop, and microknot resonators is included. In selective modifications of the microknot coupling area shape and the refractive index profile, we have studied the microknot transmission characteristics. A recipe for the experimental realization of a 4-fold increase of values in microknot resonators is prescribed, where resonance parameters are beneficial for sensing applications, both in physical (temperature and refractive index) and in chemical (humidity and other gas components) characterizations.

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All-optical tunable delay line based on nonlinearities in a chalcogenide microfiber coil resonator

Cited by 4 publications

References 36 publications

Resonantly enhanced all‐optical switching in microfibre Mach–Zehnder interferometers

Resonantly enhanced all‐optical switching in microfibre Mach–Zehnder interferometers

Recent Progress in Silicon-Based Slow-Light Electro-Optic Modulators

Optimizing contact area geometry and taper composition in microknot resonators

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