NEW DELHI — March 17, 2026 : India’s Defence Research and Development Organisation (DRDO) is advancing the development of optical photonic radar modules intended for integration into the Advanced Medium Combat Aircraft (AMCA) Mk2, marking a transition from conventional semiconductor-based radar systems toward light-based sensing architectures.
The technology is being aligned with the AMCA Mk2 development schedule, with integration targeted for the mid-2030s. Following the successful site acceptance testing of India’s baseline photonic radar system in August 2025, the program places India among a limited group of countries, including the United States, China, and Israel, working on photonic radar applications for military aviation.
Transition from Electronic to Photonic Radar Systems
Conventional radar systems, including modern Active Electronically Scanned Array (AESA) radars based on Gallium Nitride (GaN) technology, rely on electronic circuits and semiconductor components to generate, transmit, and process radio frequency (RF) signals.
The photonic radar under development replaces key electronic subsystems with optical technologies such as Photonic Integrated Circuits (PICs), lasers, and fiber-optic networks. Instead of generating RF signals purely through electronic oscillators, the system uses laser sources and optical modulation techniques to produce and process radar signals.
A central mechanism in this architecture is optical heterodyning, where two laser beams with slightly different frequencies are combined. The interaction between these beams generates a beat frequency that falls within the RF or microwave domain. This approach enables the generation of highly stable, low-noise signals across a wide frequency spectrum.
Because the signal processing occurs in the optical domain, the system can access significantly larger instantaneous bandwidths, extending into the terahertz range. This removes several limitations of electronic systems, including bandwidth constraints, thermal inefficiencies, and phase noise associated with semiconductor devices.
Operating Principle and Signal Processing
In a photonic radar system, a laser source generates coherent light, which is then modulated with radar waveforms using electro-optic modulators. These optical signals are transmitted through fiber-optic channels and converted into RF signals for emission via antenna arrays.
When reflected signals return from a target, they are captured and converted back into optical signals. These are then processed using photonic signal processors, which analyze frequency shifts, phase variations, and time delays to determine target distance, velocity, and structural characteristics.
The use of optical signal paths reduces electromagnetic interference within the system and enables high-speed data transfer between subsystems. Additionally, wavelength division multiplexing (WDM) allows multiple signals—such as radar, communications, and electronic warfare data—to be transmitted simultaneously over a single optical fiber by using different light wavelengths.
High-Resolution Target Detection
One of the primary characteristics of photonic radar is its resolution. The system under development is designed to achieve approximately 1.3-centimeter resolution, significantly higher than conventional radar systems.
This level of precision enables detailed imaging of airborne targets, including the ability to resolve structural features and small mechanical elements. The wide bandwidth and multi-frequency operation allow the radar to illuminate targets across a broad spectrum, improving detection of low-observable or stealth aircraft.
Traditional stealth designs rely on shaping and radar-absorbent materials (RAM) to reduce reflections in specific frequency bands. Photonic radar’s ability to operate across wider frequency ranges reduces the effectiveness of such measures, improving detection probability.
Resistance to Electronic Warfare
Photonic radar systems offer increased resilience against electronic warfare (EW) and jamming. Since signal generation and processing occur in the optical domain, the system is less susceptible to conventional RF jamming techniques that target electronic circuits.
The architecture also supports rapid frequency agility and advanced frequency-hopping methods. Combined with low phase noise and wide bandwidth, these features complicate adversary attempts to interfere with or deceive the radar system.
Integration with Aircraft Systems
The use of fiber-optic infrastructure enables integration of multiple onboard functions within a unified architecture. Through wavelength division multiplexing (WDM), radar, communications, and electronic warfare systems can operate concurrently over shared optical networks.
This approach offers several system-level advantages:
- Weight Reduction: Fiber-optic cables replace heavier copper wiring, reducing overall aircraft weight.
- Improved Processing Speed: Optical data transmission enables faster signal handling and reduced latency.
- Reduced Electromagnetic Interference: Optical systems are immune to electromagnetic cross-talk between onboard electronics.
The distributed nature of photonic systems also supports future “smart skin” aircraft designs. In such configurations, sensors embedded across the airframe allow the aircraft’s surface to function as a continuous sensing array, providing near 360-degree coverage.
Development Status and Testing
Development of the photonic radar is being led by DRDO’s Electronics and Radar Development Establishment (LRDE). The system is based on microwave photonics (MWP) principles and has progressed beyond initial prototyping.
Following site acceptance testing, the radar has entered integration trials, including evaluations in anechoic chamber environments. Testing is being conducted on a modified HAL Tejas Mk1A platform to validate performance parameters under controlled conditions.
Flight trials of the indigenous photonic radar system are expected to begin in the late 2025 to early 2026 timeframe, focusing on validating resolution, detection capability, and resistance to interference.
Role in AMCA Mk2 Program
The AMCA Mk2 is planned as an advanced variant of India’s indigenous fifth-generation fighter, featuring enhanced payload capacity, extended range, and improved stealth characteristics compared to the initial Mk1 configuration.
While near-term AMCA variants are expected to use advanced GaN-based AESA radars, the photonic radar is being developed for later integration as the technology matures. The system is intended to enhance long-range detection, precision targeting, and survivability in contested electromagnetic environments.
Broader Applications and Future Roadmap
The photonic radar program forms part of DRDO’s broader roadmap to transition beyond traditional AESA systems toward next-generation sensing technologies, including photonic and potentially quantum-based architectures.
Beyond fighter aircraft, the technology has potential applications in naval platforms, missile defense systems, and integrated air defense networks, where high-resolution sensing and resistance to electronic interference are critical.
The project remains in the technology maturation phase, with continued testing and validation planned over the coming years. No official timeline has been released for full operational deployment beyond its alignment with the AMCA Mk2 program in the mid-2030s.
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