Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Method and Opto-electronic apparatus for determining frequency of intercepted signal using sub-Nyquist sampling
Categories for this Invention
Category: Information & Communication Technologies (ICT) /Photonics
Industry: Semiconductor & Electronics Manufacturing, Integrated devices.
Applications: Wireless Communication Devices, Telecommunication Infrastructure,
Market: The global Opto electronic apparatus market size is estimated at USD 1.64 trillion in 2024, and is expected to reach USD 2.25 trillion by 2029, growing at a CAGR of 6.5% during the forecast period (2024-2029).
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Problem Statement
- In general, instantaneous frequency measurement (IFM) always has been a critical technology for efficient broadband spectrum sensing.
- IFM initially Started as analog and later it transforms to digital instantaneous frequency measurement (DIFM) systems.
- DIFM further develops to high-speed sample-and-hold circuits, analog-to-digital converters (ADCs), and FFT processors and aided to start the compressed sensing technologies called as sub-Nyquist sampling based frequency discriminators.
- Compressive sensing methods (such as sub-Nyquist sampling) require low frequency and low complex hardware, enabling miniaturization.
- Photonic-assisted microwave measurement techniques offer distinct advantages such as wide spectrum coverage, low frequency dependent loss, and immunity to electromagnetic interference.
- Optical sub-Nyquist sampling using mode locked lasers (MLLs) offer very low jitter performance and ability to process the signal at baseband frequencies.
- Thus there is a need for alternative technology for better results.
Technology
- An Opto-electronic apparatus for determining a frequency of an intercepted signal using sub-Nyquist sampling, the Opto-electronic apparatus comprises
- An Optical sampler for providing an Optical signal;
- A Optical delay lines for interleaving the Optical signal in each Optical delay line.
- A electro-Optic modulators for obtaining a Optically sampled versions of the intercepted signal using a corresponding interleaved Optical signal from each Optical delay lines based on the sub-Nyquist sampling, wherein the intercepted signal is a radio frequency (RF) signal.
- A Opto-electric converters for converting each Optically sampled versions of the intercepted signal into electrical domain
- A frequency estimator for determining a frequency of the intercepted signal using each Optically sampled versions of the intercepted signal in the electrical domain based on a location in the left window or the right window.
A single optical sampler is used and parallel optical delay lines are provided to multiply the repetition rate of a pulsed optical signal which is then modulated with an intercepted signal to determine a center frequency of the intercepted signal.
Key Features / Value Proposition
- A novel frequency measurement device based on optical sub-sampling.
- A novel sub-Nyquist based photonic instantaneous frequency measurement .
- The intercepted signal is a radio frequency (RF) signal.
- The optical sampler is a Mode Locked Laser (MLL) of 2 GHz repetition rate.
- Electro-optic modulators is Mach Zehnder Modulator (MZM).
- The optical signal of the intercepted signal is direct copy for odd fold and mirrored copy for even fold.
- Interleaving of the optical signal doubles a frequency of the optical signal at each of the optical delay line and Incorporation of the parallel channels was made in a single integrated optic chip.
- Highly stable and cost effective .
Applications:
- ESM systems, Radar, surveillance, telecommunications, vehicular communication.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Deepa Venkitesh
Department of Electrical Engineering
Intellectual Property
IITM IDF Ref. 2204
Patent No: IN 531779
Technology Readiness Level
TRL – 4
Technology validated in lab scale.