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The article presents a monolithic narrow-linewidth laser that integrates a topological interface state extended (TISE) laser with optical injection locking (MOIL), developed on an AlGaInAs/InP multi-quantum well (MQW) platform. This new laser design achieves significant linewidth narrowing and improved spectral purity—key for applications in coherent optical communication, sensing, and quantum key distribution (QKD).
Device Structure: The laser combines the TISE laser with a micro-ring resonator (MRR). The TISE laser, with a topological interface state, offers a uniform photon density distribution, enhancing photon injection into the MRR and improving the coupling efficiency. This integration helps maintain a narrow linewidth over a wide current injection range (65–300 mA) with a side-mode suppression ratio (SMSR) exceeding 50 dB.
Laser Performance: The linewidth is reduced from 2 MHz to 4.2 kHz, with an intrinsic linewidth of 983 Hz, demonstrating the laser's excellent frequency stability. The system operates with single-mode behavior and offers narrow linewidth suitable for high-speed modulation in optical communication and quantum applications.
Fabrication Process: The device is fabricated on an InP platform, using a straightforward process with only one step of metalorganic vapor-phase epitaxy (MOVPE) growth and inductively coupled plasma (ICP) etching. This makes the system highly scalable and suitable for integrated photonic platforms.
Quantum and Coherent Applications: The MOIL-TISE laser's phase-locking capabilities and low linewidth make it ideal for modulation-free quantum key distribution (QKD), supporting high data transmission rates and robust phase stability.
Coherence and Phase Encoding: The laser demonstrates phase adjustment capabilities, making it useful in quantum and classical coherent systems. The study also includes experiments on coherence properties and phase encoding using the laser, showing its application potential in quantum communication systems.
In conclusion, the MOIL-TISE laser offers a compact, monolithic design, achieving narrow linewidth, stable phase-locking, and robust performance. It is a promising candidate for integration into coherent optical systems and modulation-free QKD platforms.
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