[1] L S Rothman, I E Gordon, Y Babikov, et al. The HITRAN2012 molecular spectroscopic database. Journal of Quantitative Spectroscopy and Radiative Transfer, 130, 4-50(2013).

[2] S E Miller. Integrated optics: An introduction. The Bell System Technical Journal, 48, 2059-2069(1969).

[3] R Soref. Mid-infrared photonics in silicon and germanium. Nature Photonics, 4, 495-497(2010).

[4] H T Lin, Z Q Luo, T Gu, et al. Mid-infrared integrated photonics on silicon: A perspective. Nanophotonics, 7, 393-420(2017).

[5] Z Han, P Lin, V Singh, et al. On-chip mid-infrared gas detection using chalcogenide glass waveguide. Applied Physics Letters, 108, 141106(2016).

[6] K Zhang, G Böhm, M A Belkin. Mid-infrared microring resonators and optical waveguides on an InP platform. Applied Physics Letters, 120, 061106(2022).

[7] J Faist, F Capasso, D L Sivco, et al. Quantum cascade laser. Science, 264, 553-556(1994).

[8] R Q Yang. Infrared laser based on intersubband transitions in quantum wells. Superlattices and Microstructures, 17, 77-83(1995).

[9] J R Meyer, W W Bewley, C L Canedy, et al. The interband cascade laser. Photonics, 7, 75(2020).

[10] Y Yao, A J Hoffman, C F Gmachl. Mid-infrared quantum cascade lasers. Nature Photonics, 6, 432-439(2012).

[11] M Smit, K Williams, Der Tol J Van. Past, present, and future of InP-based photonic integration. APL Photonics, 4, 050901(2019).

[12] J Montoya, C Wang, A Goyal, et al. Integration of quantum cascade lasers and passive waveguides. Applied Physics Letters, 107, 031110(2015).

[13] S Jung, D Palaferri, K Zhang, et al. Homogeneous photonic integration of mid-infrared quantum cascade lasers with low-loss passive waveguides on an InP platform. Optica, 6, 1023-1030(2019).

[14] R J Wang, P Taschler, Z X Wang, et al. Monolithic integration of mid-infrared quantum cascade lasers and frequency combs with passive waveguides. ACS Photonics, 9, 426-431(2022).

[15] [15] Faist J. Quantum Cade Lasers[M]. Oxfd: Oxfd University Press, 2013.

[16] K Giewont, K Nummy, F A Anderson, et al. 300-mm monolithic silicon photonics foundry technology. IEEE Journal of Selected Topics in Quantum Electronics, 25, 18632360(2019).

[17] H Nguyen-Van, A N Baranov, Z Loghmari, et al. Quantum cascade lasers grown on silicon. Science Reports, 8, 7206(2018).

[18] Z Loghmari, J B Rodriguez, A N Baranov, et al. InAs-based quantum cascade lasers grown on on-axis (001) silicon substrate. APL Photonics, 5, 041302(2020).

[19] R Go, H Krysiak, M Fetters, et al. InP-based quantum cascade lasers monolithically integrated onto silicon. Optics Express, 26, 22389-22393(2018).

[20] Z Wang, A Abbasi, U Dave, et al. Novel light source integration approaches for silicon photonics. Laser & Photonics Reviews, 11, 1700063(2017).

[21] G Roelkens, L Liu, D Liang, et al. III-V/silicon photonics for on-chip and intra-chip optical interconnects. Laser & Photonics Reviews, 4, 751-779(2010).

[22] A Spott, J Peters, M L Davenport, et al. Quantum cascade laser on silicon. Optica, 3, 000545(2016).

[23] A Spott, J Peters, M L Davenport, et al. Heterogeneously integrated distributed feedback quantum cascade lasers on silicon. Photonics, 3, 35(2016).

[24] E J Stanton, A Spott, J Peters, et al. Multi-spectral quantum cascade lasers on silicon with integrated multiplexers. Photonics, 6, 6010006(2019).

[25] S Radosavljevic, A Radosavljevic, C Schilling, et al. Thermally tunable quantum cascade laser with an external germanium-on-SOI distributed Bragg reflector. IEEE Journal of Selected Topics in Quantum Electronics, 25, 1200407(2019).