[1] X Bao, W Li, Z Qin et al. OTDR and OFDR for distributed multi-parameter sensing. Proc SPIE, 9062(2014).

[2]

[3] X Sun, J B Abshire. Comparison of IPDA lidar receiver sensitivity for coherent detection and for direct detection using sine-wave and pulsed modulation. Opt Express, 20, 21291(2012).

[4]

[5] J R Demers, R T Logan, E R Brown. An optically integrated coherent frequency-domain THz spectrometer with signal-to-noise ratio up to 80 dB. Microw Photonics, 92(2007).

[6]

[7]

[8] L Atzori, A Iera, G Morabito. The internet of things: A survey. Comput Netw, 54, 2787(2010).

[9] D Marpaung, M Burla, J Capmany. New opportunities for integrated microwave photonics. IEEE Photonics Technol Lett, 30, 1813(2018).

[10] N Dostart, B Zhang, A Khilo et al. Serpentine optical phased arrays for scalable integrated photonic LIDAR beam steering. Optica, 7, 726(2020).

[11]

[12] T Nagatsuma, H Ito, K Iwatsuki. Generation of low-phase noise and frequency-tunable millimeter-/terahertz-waves using optical heterodyning techniques with uni-traveling carrier photodiodes. 2006 European Microwave Conference, 1103(2006).

[13] V M Gelikonov. Measurement of nanoangström oscillatory displacements by a gas laser with a small natural linewidth. Radiophys Quantum Electron, 41, 998(1998).

[14] S Mo, X Huang, S Xu et al. 600-Hz linewidth short-linear-cavity fiber laser. Opt Lett, 39, 5818(2014).

[15] D Lo, S K Lam, C Ye et al. Narrow linewidth operation of solid state dye laser based on sol-gel silica. Opt Commun, 156, 316(1998).

[16] C K Laue, R Knappe, K J Boller et al. Wavelength tuning and spectral properties of distributed feedback diode lasers with a short external optical cavity. Appl Opt, 40, 3051(2001).

[17] P Signoret, M Myara, J P Tourrenc et al. Bragg section effects on linewidth and lineshape in 1.55-μm DBR tunable laser diodes. IEEE Photonics Technol Lett, 16, 1429(2004).

[18] C H Henry. Theory of the linewidth of semiconductor lasers. IEEE J Quantum Electron, 18, 259(1982).

[19] K Y Liou, K Duttan, A Burrusc. Linewidth narrow distributed feedback injection lasers with long cavity length and detuned Bragg wavelength. Appl Phys Lett, 50, 489(1987).

[20] J Ma, L R Wang, Y T Zhao et al. Absolute frequency stabilization of a diode laser to cesium atom-molecular hyperfine transitions via modulating molecules. Appl Phys Lett, 91, 161101(2007).

[21] E Patzak, A Sugimura, S Saito et al. Semiconductor laser linewidth in optical feedback configurations. Electron Lett, 19, 1026(2007).

[22] M R Olcay, J A Pasqual, J A Lisboa et al. Tuning of a narrow linewidth pulsed dye laser with a Fabry-Perot and diffraction grating over a large wavelength range. Appl Opt, 24, 3146(1985).

[23] W Liang, V S Ilchenko, A A Savchenkov et al. Whispering-gallery-mode-resonator-based ultranarrow linewidth external-cavity semiconductor laser. Opt Lett, 35, 2822(2010).

[24]

[25] M A Tran, D Huang, J Bowers. Tutorial on narrow linewidth tunable semiconductor lasers using Si/III-V heterogeneous integration. APL Photonics, 4, 111101(2019).

[26] T Komljenovic, J E Bowers. Monolithically integrated high-Q rings for narrow linewidth widely tunable lasers. IEEE J Quantum Electron, 51, 1(2015).

[27]

[28] H Ou. Different index contrast silica-on-silicon waveguides by PECVD. Electron Lett, 39, 212(2003).

[29] W Bogaerts, R Baets, P Dumon et al. Nanophotonic waveguides in silicon-on-insulator fabricated with CMOS technology. J Lightwave Technol, 23, 401(2005).

[30] X Ji, F A S Barbosa, S P Roberts et al. Ultra-low-loss on-chip resonators with sub-milliwatt parametric oscillation threshold. Optica, 4, 619(2017).

[31] M Tran, D Huang, T Komljenovic et al. Ultra-low-loss silicon waveguides for heterogeneously integrated silicon/III-V photonics. Appl Sci, 8, 1139(2018).

[32] T Takeuchi, M Takahashi, K Suzuki et al. Wavelength tunable laser with silica-waveguide ring resonators. IEICE Trans Electron, 92, 198(2009).

[33] A H Atabaki, E S Hosseini, A A Eftekhar et al. Optimization of metallic microheaters for high-speed reconfigurable silicon photonics. Opt Express, 18, 18312(2010).

[34] G Poberaj, H Hu et al. Lithium niobate on insulator (LNOI) for micro-photonic devices. Laser Photon Rev, 6, 488(2012).

[35] M Belt, M L Davenport, J E Bowers et al. Ultra-low-loss Ta₂O₅-core/SiO₂-clad planar waveguides on Si substrates. Optica, 4, 532(2017).

[36] K J Boller, A V Rees, Y Fan et al. Hybrid integrated semiconductor lasers with silicon nitride feedback circuits. Photonics, 7, 4(2019).

[37] B Liu, A Shakouri, J E Bowers. Passive microring-resonator-coupled lasers. Appl Phys Lett, 79, 3561(2001).

[38] J F Liu, X C Sun, R Camacho-Aguilera et al. Ge-on-Si laser operating at room temperature. Opt Lett, 35, 679(2010).

[39] G T Reed, A P Knights, M Liao et al. Integrating III-V quantum dot lasers on silicon substrates for silicon photonics. SPIE Opto, 101081A(2017).

[40]

[41] G Roelkens, L Liu, D Liang et al. III-V/silicon photonics for on-chip and intra-chip optical interconnects. Laser Photon Rev, 4, 751(2010).

[42] T Tsuchizawa, K Yamada, H Fukuda et al. Microphotonics devices based on silicon microfabrication technology. IEEE J Sel Top Quantum Electron, 11, 232(2005).

[43]

[44] K Suzuki, J A Kubby, G T Reed et al. Wavelength tunable laser diodes with Si-wire waveguide ring resonator wavelength filters. Proc SPIE, 7943, 79431G(2011).

[45] K Nemoto, T Kita, H Yamada. Narrow-spectral-linewidth wavelength-tunable laser diode with Si wire waveguide ring resonators. Appl Phys Express, 5, 2701(2012).

[46] R M Oldenbeuving, E J Klein, H L Offerhaus et al. 25 kHz narrow spectral bandwidth of a wavelength tunable diode laser with a short waveguide-based external cavity. Laser Phys Lett, 10, 015804(2013).

[47]

[48] T Kita, K Nemoto, H Yamada. Silicon photonic wavelength-tunable laser diode with asymmetric Mach-Zehnder interferometer. IEEE J Sel Top Quantum Electron, 20, 344(2014).

[49] T Kita, K Nemoto, H Yamada. Long external cavity Si photonic wavelength tunable laser diode. Jpn J Appl Phys, 53, 04E(2014).

[50]

[51]

[52] N Kobayashi, K Sato, M Namiwaka et al. Silicon photonic hybrid ring-filter external cavity wavelength tunable lasers. J Lightwave Technol, 33, 1241(2015).

[53] R Tang, T Kita, H Yamada. Narrow-spectral-linewidth silicon photonic wavelength-tunable laser with highly asymmetric Mach-Zehnder interferometer. Opt Lett, 40, 1504(2015).

[54]

[55]

[56] T Kita, R Tang, H Yamada. Narrow spectral linewidth silicon photonic wavelength tunable laser diode for digital coherent communication system. IEEE J Sel Top Quantum Electron, 22, 23(2016).

[57] S Brian, J Xingchen, D Avik et al. Compact narrow-linewidth integrated laser based on a low-loss silicon nitride ring resonator. Opt Lett, 42, 4541(2017).

[58]

[59] Y Lin, C Browning, R B Timens et al. Characterization of hybrid InP-TriPleX photonic integrated tunable lasers based on silicon nitride (Si₃N₄/SiO₂) microring resonators for optical coherent system. IEEE Photonics J, 10, 1(2018).

[60] Y Li, Y Zhang, H Chen et al. Tunable self-injected fabry-perot laser diode coupled to an external high-Q Si₃N₄ /SiO₂ microring resonator. J Lightwave Technol, 36, 3269(2018).

[61] Y Zhu, L Zhu. Narrow-linewidth, tunable external cavity dual-band diode lasers through InP/GaAs-Si₃N₄ hybrid integration. Opt Express, 27, 2354(2019).

[62] C Xiang, P A Morton, J E Bowers. Ultra-narrow linewidth laser based on a semiconductor gain chip and extended Si₃N₄ Bragg grating. Opt Lett, 44, 3825(2019).

[63] Y Y Zhu, S W Zeng, L Zhu. Optical beam steering by using tunable, narrow-linewidth butt-coupled hybrid lasers in a silicon nitride photonics platform. Photonics Res, 8, 03000375(2020).

[64] Y W Fan, A van Rees, P J Van der Slot et al. Hybrid integrated InP-Si₃N₄ diode laser with a 40-Hz intrinsic linewidth. Opt Express, 28, 21713(2020).

[65] Y Hu, W Cao, X S Tang et al. High power, high SMSR and wide tuning range silicon micro-ring tunable laser. Opt Express, 25, 8029(2017).

[66]

[67] H Park, A W Fang, S Kodama et al. Hybrid silicon evanescent laser fabricated with a silicon waveguide and III-V offset quantum wells. Opt Express, 13, 9460(2005).

[68]

[69] S Keyvaninia, G Roelkens, D Van Thourhout et al. Demonstration of a heterogeneously integrated III-V/SOI single wavelength tunable laser. Opt Express, 21, 3784(2013).

[70] J C Hulme, J K Doylend, J E Bowers. Widely tunable Vernier ring laser on hybrid silicon. Opt Express, 21, 19718(2013).

[71] T Komljenovic, S Srinivasan, E Norberg et al. Widely tunable narrow-linewidth monolithically integrated external-cavity semiconductor lasers. IEEE J Sel Top Quantum Electron, 21, 214(2015).

[72]

[73]

[74]

[75] D Huang, M A Tran, J Guo et al. High-power sub-kHz linewidth lasers fully integrated on silicon. Optica, 6, 745(2019).

[76] M A Tran, D Huang, J Guo et al. Ring-resonator based widely-tunable narrow-linewidth Si/InP integrated lasers. IEEE J Sel Top Quantum Electron, 26, 1(2019).

[77] K Aoyama, S Kobayashi, M Wada et al. Compact narrow-linewidth optical negative feedback laser with Si optical filter. Appl Phys Express, 11, 112703(2018).

[78] G D’Agostino et al. Low-loss passive waveguides in a generic InP foundry process via local diffusion of zinc. Opt Express, 23, 25143(2015).

[79] S Andreou, K A Williams, E A J M Bente. Monolithically integrated InP-based DBR lasers with an intra-cavity ring resonator. Opt Express, 27, 26281(2019).

[80] J Wang, R Y Zhan, B C Qiu et al. Design of high-Q compact passive ring resonators via incorporating a loss-compensated structure for high performance angular velocity sensing in monolithic integrated-optical-gyroscopes. IEEE Sens J, 17, 84(2017).

[81] C C Luo, J Wang, B C Qiu et al. Gain spectral narrowing of semiconductor laser based on dual-core vertical coupler structure. Opt Commun, 474, 126166(2020).

[82]

[83]