| PhD Seminar

Name of the Speaker: Ms. Anushka Tiwari (EE19D032)
Guide: Dr. Bijoy Krishna Das
Co-Guide: Dr. Enakshi Bhattacharya
Venue: ESB-244 (Seminar Hall)
Online meeting link: https://meet.google.com/kas-oyxt-rpt
Date/Time: 9th October 2025 (Thursday), 2:30 PM
Title: Silicon Photonics Integrated Widely Tunable Microwave Photonics Oscillator

Abstract :

Photonics-enabled microwave signal generation provides an effective route for broadband and high-frequency signal processing, driving advancements in applications such as RADAR and next-generation wireless communication. Among the various approaches, the optoelectronic oscillators (OEO) have been widely investigated over the years. With the recent emergence of CMOS-compatible silicon photonics technology as a mainstream platform, chip-scale microwave photonics has become a powerful hybrid approach that combines photonics and microwave technologies to deliver scalable, cost-effective solutions with reduced hardware complexities. A microwave photonic oscillator (MPO) integrated with an on-chip microwave photonic filter offers a compact and reconfigurable architecture, enabled by on-chip filter tuning. However, achieving narrowband filtering along with high signal quality in terms of side-mode suppression ratio (SMSR) and phase noise remains a critical challenge. The core of the MPO is a narrowband integrated microwave photonic filter, which can be realized using a photonic microring resonator (MRR). For such filters, a high-quality factor (Q) and a large free spectral range (FSR) of an MRR are critical performance metrics to simultaneously achieve narrowband operation and broadband tunability.

This talk will present a detailed design of a high-Q MRR (∼ 1.7 × 106) in a silicon photonics technology platform and its successful application for demonstrating high-performance, widely tunable MPO (up to 60 GHz), exhibiting SMSR of ∼ 70 dB and phase noise of ∼ -125 dBc/Hz.