[1] [1] Zhang, G.J., Wu, X.L.: A novel CO2 gas analyzer based on IR absorption. Opt. Lasers Eng. 42(2), 219–231 (2004)

[2] [2] Tan, Q.L., Tang, L.C., Yang, M.L., Xue, C.Y., Zhang, W.D., Liu,J., Xiong, J.J.: Three-gas detection system with IR optical sensor based on NDIR technology. Opt. Lasers Eng. 74, 103–108 (2015)

[3] [3] Ma, H., Yang, H., Tang, B., Wei, M., Li, J., Wu, J., Zhang, P., Sun,C., Li, L., Lin, H.: Passive devices at 2 μm wavelength on 200 mm CMOS-compatible silicon photonics platform. Chin. Opt. Lett.19(7), 071301 (2021)

[4] [4] Liu, Z.X., Chen, Y., Li, Z.H., Kelly, B., Phelan, R., O’Carroll, J.,Bradley, T., Wooler, J.P., Wheeler, N.V., Heidt, A.M., Richter, T.,Schubert, C., Becker, M., Poletti, F., Petrovich, M.N., Alam, S.,Richardson, D.J., Slavík, R.: High-capacity directly modulated optical transmitter for 2-μm spectral region. J. Lightwave Technol.33(7), 1373–1379 (2015)

[5] [5] Soref, R.: Enabling 2 μm communications. Nat. Photonics 9(6),358–359 (2015)

[6] [6] Kong, D., Liu, Y., Ren, Z., Jung, Y., Kim, C., Chen, Y., Wheeler,N.V., Petrovich, M.N., Pu, M., Yvind, K., Galili, M., Oxenlowe,L.K., Richardson, D.J., Hu, H.: Super-broadband on-chip continuous spectral translation unlocking coherent optical communications beyond conventional telecom bands. Nat. Commun. 13(1),4139 (2022)

[7] [7] Kato, T., Muranaka, H., Tanaka, Y., Akiyama, Y., Hoshida, T.,Shimizu, S., Kobayashi, T., Kazama, T., Umeki, T., Watanabe,K., Miyamoto, Y.: S plus C plus L-band WDM transmission using 400-Gb/s real-time transceivers extended by PPLN-based wavelength converter. In: Proceedings of 2022 European Conference on Optical Communication (Ecoc) (2022)

[8] [8] Ophir, N., Lau, R.K.W., Ménard, M., Salem, R., Padmaraju, K.,Okawachi, Y., Lipson, M., Gaeta, A.L., Bergman, K.: First Demonstration of a 10-Gb/s RZ end-to-end four-wave-mixing based link at 1884 nm using silicon nanowaveguides. IEEE Photonics Technol. Lett. 24(4), 276–278 (2012)

[9] [9] Zhao, P., He, Z., Shekhawat, V., Karlsson, M., Andrekson, P.A.:100-Gbps per-channel all-optical wavelength conversion without pre-amplifiers based on an integrated nanophotonic platform.Nanophotonics 12(17), 3427–3434 (2023)

[10] [10] Da Ros, F., Gajda, A., da Silva, E.P., Peczek, A., Mai, A., Petermann,K., Zimmermann, L., Oxenlowe, L.K., Galili, M.: Optical phase conjugation in a silicon waveguide with lateral p-i-n diode for nonlinearity compensation. J. Lightwave Technol. 37(2),323–329 (2019)

[11] [11] Ettabib, M.A., Hammani, K., Parmigiani, F., Jones, L., Kapsalis,A., Bogris, A., Syvridis, D., Brun, M., Labeye, P., Nicoletti, S.,Petropoulos, P.: FWM-based wavelength conversion of 40 Gbaud PSK signals in a silicon germanium waveguide. Opt. Express 21(14), 16683–16689 (2013)

[12] [12] Liu, X.P., Kuyken, B., Roelkens, G., Baets, R., Osgood, R.M., Jr.,Green, W.M.J.: Bridging the mid-infrared-to-telecom gap with silicon nanophotonic spectral translation. Nat. Photonics 6(10),667–671 (2012)

[13] [13] Agrawal, G.P.: Nonlinear fiber optics: its history and recent progress.J. Opt. Soc. Am. B 28(12), A1–A10 (2011)

[14] [14] Aitchison, J.S., Hutchings, D.C., Kang, J.U., Stegeman, G.I., Villeneuve,A.: The nonlinear optical properties of AlGaAs at the half band gap. IEEE J. Quantum Electron. 33(3), 341–348 (1997)

[15] [15] Shoji, I., Kondo, T., Kitamoto, A., Shirane, M., Ito, R.: Absolute scale of second-order nonlinear-optical coefficients. J. Opt. Soc.Am. B 14(9), 2268–2294 (1997)

[16] [16] Savanier, M., Andronico, A., Lema-tre, A., Galopin, E., Manquest,C., Favero, I., Ducci, S., Leo, G.: Large second-harmonic generation at 1.55 μm in oxidized AlGaAs waveguides. Opt. Lett. 36(15),2955–2957 (2011)

[17] [17] Stassen, E., Kim, C., Kong, D.M., Hu, H., Galili, M., Oxenlowe,L.K., Yvind, K., Pu, M.H.: Ultra-low power all-optical wavelength conversion of high-speed data signals in high-confinement AlGaAson-insulator microresonators. APL Photonics 4(10), 100804 (2019)

[18] [18] Pu, M.H., Ottaviano, L., Semenova, E., Yvind, K.: Efficient frequency comb generation in AlGaAs-on-insulator. Optica 3(8),823–826 (2016)

[19] [19] Chang, L., Xie, W.Q., Shu, H.W., Yang, Q.F., Shen, B.Q., Boes,A., Peters, J.D., Jin, W.R., Xiang, C., Liu, S.T., Moille, G., Yu,S.P., Wang, X.J., Srinivasan, K., Papp, S.B., Vahala, K., Bowers,J.E.: Ultra-efficient frequency comb generation in AlGaAs-oninsulator microresonators. Nat. Commun. 11(1), 1331 (2020)

[20] [20] Pu, M.H., Hu, H., Ottaviano, L., Semenova, E., Vukovic, D.,Oxenlowe, L.K., Yvind, K.: Ultra-efficient and broadband nonlinear AlGaAs-on-insulator chip for low-power optical signal processing. Laser Photonics Rev. 12(12), 1800111 (2018)

[21] [21] Chang, L., Boes, A., Pintus, P., Xie, W.Q., Peters, J.D., Kennedy,M.J., Jin, W.R., Guo, X.W., Yu, S.P., Papp, S.B., Bowers, J.E.:Low loss (Al)GaAs on an insulator waveguide platform. Opt. Lett.44(16), 4075–4078 (2019)

[22] [22] Bonneville, D.B., Frankis, H.C., Wang, R., Bradley, J.D.B.:Erbium-ytterbium co-doped aluminium oxide waveguide amplifiers fabricated by reactive co-sputtering and wet chemical etching.Opt. Express 28(20), 30130–30140 (2020)

[23] [23] Zhang, Z., Li, S., Gao, R., Zhang, H., Lin, J., Fang, Z., Wu, R.,Wang, M., Wang, Z., Hang, Y., Cheng, Y.: Erbium-ytterbium codoped thin-film lithium niobate integrated waveguide amplifier with a 27 dB internal net gain. Opt. Lett. 48(16), 4344–4347(2023)

[24] [24] Zhang, M.J., Lu, J.C., Chen, Y.Z., Wei, Y.H., Shao, Y.Q., Li, Z.K.,Ma, F.K., Huang, S.Q., Li, Z., Chen, Z.Q., Wang, R.P., Li, Z.H.:Study on Er3+- Yb3+ co-doped La2O3- Al2O3 glasses for C-band optical waveguide amplifier with high luminous efficiency and low pump threshold. Ceram. Int. 48(21), 32236–32240 (2022)

[25] [25] Dong, Z., Zhao, Y., Wang, Y., Wei, W., Ding, L., Tang, L., Li, Y.:Gain optimization of an erbium-ytterbium co-doped amplifier via a Si3N4 photonic platform. Opt. Express 31(21), 35419–35430(2023)

[26] [26] Adams, R., Spasojevic, M., Chagnon, M., Malekiha, M., Li, J.,Plant, D.V., Chen, L.R.: Wavelength conversion of 28 GBaud 16-QAM signals based on four-wave mixing in a silicon nanowire.Opt. Express 22(4), 4083–4090 (2014)

[27] [27] Wei, J.J., Hu, Z.H., Zhang, M.M., Li, P., Wu, Y., Zeng, C., Tang,M., Xia, J.S.: All-optical wavelength conversion of a 92-Gb/s 16-QAM signal within the C-band in a single thin-film PPLN waveguide. Opt. Express 30(17), 30564–30573 (2022)

[28] [28] Huang, Y., Tien, E.K., Gao, S., Kalyoncu, S.K., Song, Q., Qian,F., Adas, E., Yildirim, D., Boyraz, O.: Electrical signal-to-noise ratio improvement in indirect detection of mid-IR signals by wavelength conversion in silicon-on-sapphire waveguides. Appl. Phys.Lett. 99(18), 181122 (2011)

[29] [29] Kylemark, P., Hedekvist, P.O., Sunnerud, H., Karlsson, M.,Andrekson, P.A.: Noise characteristics of fiber optical parametric amplifiers. J. Lightwave Technol. 22(2), 409–416 (2004)