High Performance L-Band Thermally Tuned Multi-Channel Interference Laser Based on Butt-Joint Regrowth With Fast Characterization

Le résumé fourni par la source

To meet the growing bandwidth demands of AI data centers and 5G/6G networks, expanding transmission capacity into the C+L bands has become essential for next-generation optical transport networks. We demonstrate a monolithically integrated InP-based high-power, narrow-linewidth L-band laser, utilizing a thermally tuned multi-channel interference (MCI) design and an innovative fast characterization algorithm to streamline calibration. The device is packaged in a compact 14 × 7 × 4 mm3module, compatible with various small form-factor pluggable (SFP) transceivers. The laser exhibits a wide tuning range exceeding 60 nm covering the full L-band, with a side-mode suppression ratio (SMSR) consistently above 48 dB. By utilizing suspended waveguides in phase shifters, the total thermal tuning power is reduced to below 35 mW, outperforming the exceeding 60 mW/FSR consumption of conventional SiPh/SiN counterparts. Through InGaAlAs multiple quantum wells and butt-joint regrowth, interface losses are minimized, yielding an intrinsic linewidth below 90 kHz. The packaged module delivers fiber-coupled output power over 17 dBm, showing a substantial power advantage. Moreover, integrated monitor photodiodes and an etalon discriminator enable precise closed-loop control, achieving power stability within ± 0.1 dB and frequency accuracy within ±0.5 GHz. These results highlight the device's potential as a high-performance light source for high-capacity optical communication systems.

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