We demonstrate a C-band gain-switched seed laser intended for a EDFA-based fiber laser meeting the performance, footprint, robustness, and cost targets for volume time-of-flight LiDAR systems. The technology reported here leverages Freedom Photonics high-power DFBs coupled with a Black Forest Engineering control ASIC in a low-inductance package. As a result, the overall package is a compact form factor that can fit within a 16-pin butterfly package. To date, our 1550 nm seed technology delivers more than 2.5 nJ pulse energy for a 480KHz repetition rate on a 4 ns pulse, which is 30 times higher than conventional seed lasers. This technology is the first of its kind to realize a 1550 nm high-pulse energy seed laser for volume deployment of time-of-flight fiber-laser-based LiDAR systems.
In this work, we present a compact size and highly efficient nanosecond pulsed 1550nm single mode fiber laser that can operate from -40C to +95C. The laser generates 2 to 10 ns pulses at a repetition rate of hundreds kHz to a few MHz with hundreds to kilowatt peak power. The design of this laser is optimized to achieve over 10% wall-plug efficiency at room temperature with an ultra-low ASE noise less than 1%. The performance is also well maintained with less than 30% EO (electrical-optical) efficiency degradation at extreme temperatures and demonstrates high reliability consistent with deployment into harsh environments.The robust performance makes the laser an ideal source for lidar and sensing applications, along with other medical, scientific, and industrial applications.
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