Optical Multi-Format Transmitter (OMFT) for Coherent LiDAR

Coherent LiDAR is moving quickly beyond the simple linear frequency-modulated continuous-wave (FMCW) chirp that defined its first generation. Research groups working on automotive perception, industrial metrology, and defence ranging are now investigating non-linear chirps, stepped-frequency formats, phase-coded sequences, and hybrid modulation schemes that promise finer range resolution, better clutter rejection, or the ability to carry a communication channel on the same optical link that performs ranging. Exploring any of these architectures experimentally requires a signal source that is not locked into one waveform shape, which is exactly the gap the Optical Multi-Format Transmitter, or OMFT, from ID Photonics is built to fill.

The OMFT is a reference transmitter platform rather than a fixed-function chirp generator. It accepts a wide range of drive waveforms and modulation formats, giving a research team the freedom to program and iterate on chirp shape, bandwidth, and modulation scheme without redesigning their optical front end for every experiment. Because coherent LiDAR performance depends heavily on how cleanly a chirp is generated, and on how linear or deliberately non-linear it is across its sweep, a transmitter that can be reconfigured in software rather than rebuilt in hardware shortens the iteration cycle between waveform design and measured range-Doppler performance considerably.

When specifying an OMFT for a research programme, the details that matter most are the range of modulation formats it can generate, the bandwidth over which it can sweep, its optical output power into the test setup, and how readily it interfaces with third-party arbitrary waveform generators or FPGA-based control electronics already in use in the lab. Because the platform is built around a Mach-Zehnder modulator architecture, researchers should also confirm bias-point stability and extinction ratio, both of which directly affect how faithfully the generated chirp matches the intended waveform design. Teams planning to test communication-over-ranging schemes should additionally weigh how much of the transmitter’s available bandwidth remains for a data channel once the ranging waveform itself is accounted for.