Faculty Publications

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Author: search.filters.author.Thayaba Nausheen, A.Has files: No

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    Numerical investigation of Microwave Photonic Link Using Different Electrical Filters
    (Institute of Electrical and Electronics Engineers Inc., 2023) Drishti, D.; Thayaba Nausheen, A.; Singh, M.
    In optical fiber communication systems, the performance is affected by a critical parameter called dispersion. Dispersion causes a pulse of light to broaden as it travels through a medium. This is because the different wavelengths or modes in the pulse travel at slightly different speeds, causing them to arrive at different times. Over a long distance, this can cause the pulse to spread out and overlap with neighboring pulses, leading to errors in data transmission or other types of signal degradation. To overcome this problem, there is a demand for efficient filters (both optical and electrical) in the dispersion compensating modules. In this work, we have analyzed the performance of two Electrical Filters (Low pass Butterworth and Raised Cosine filters). The Opti-system software is used for numerical modeling, which confirm that Raised Cosine Filter is better than Butterworth electric filters. The maximum Q-factor of 16.0572 and a minimum bit rate of 2.48771e-058 at 10 Gbit/s is obtained near the telecommunication wavelength. © 2023 IEEE.
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    Aperture-Coupled Plasmonic Ring Resonator-Based Temperature Sensor: 3-D FEM Modeling
    (Institute of Electrical and Electronics Engineers Inc., 2024) Thayaba Nausheen, A.; Nakul Nayak, B.V.; Khanna, A.; Singh, M.
    Nanophotonic ring resonators have emerged as promising candidates for sensing applications due to their high sensitivity and compact footprint. In this study, we investigated a 3-D aperture-coupled plasmonic microring resonator (AC-PMRR)-cum-plasmonic spectral shaper as a temperature sensor using finite-element method (FEM). The sensor operates based on the principle of the temperature-dependent refractive index change of the surrounding medium, which modulates the resonance characteristics of the microring. The aperture coupling technique enhances the sensitivity and allows efficient excitation of localized surface plasmon resonances. We analyzed the sensing performance of the proposed device through rigorous numerical simulations. The effects of various design parameters, such as ring radius, aperture size, and coupling distance, on the sensor's performance are systematically examined. Furthermore, we explore the influence of material properties and temperature range on the sensor's sensitivity and resolution. The proposed refractive index sensor demonstrates a high sensitivity of ~0.065 nm/K, the figure of merit of ~102 RIU1, and detection accuracy of ~0.32 nm1, making it suitable for various temperature sensing applications in fields such as environmental monitoring, biomedical diagnostics, and industrial process control. © 2024 IEEE.
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    Widely-tunable optoelectronic oscillator using a microfiber coupler Sagnac loop
    (Springer, 2025) Meena, K.S.R.; Thayaba Nausheen, A.; Singh, M.
    An optoelectronic oscillator (OEO) integrating a Microfiber Coupler Sagnac loop and a parallel optical amplifier is proposed for the generation of wide-range, stable microwave signals. Unlike conventional OEOs that rely on dual-loop configurations, fixed optical delay lines, or bulky and lossy external filters, our design offers a solution capable of generating RF signals over a broad frequency range of 5–20 GHz. Sagnac loop provides high-resolution spectral filtering and substantial side-mode suppression, while the parallel optical amplifier enhances the loop gain and facilitates the stable oscillation across the entire tuning bandwidth. Our results confirm multi-tone microwave signal generation with a side-mode suppression ratio exceeding 50 dB. The single sideband phase noise of about ? 125 dBc/Hz at 10 kHz offset frequency is achieved for 10 GHz oscillation frequency. This hybrid architecture leads to highly stable, tunable, and pure microwave signal generation, making it suitable for radar systems, high-speed communication, and advanced sensing applications. © The Author(s), under exclusive licence to The Optical Society of India 2025.