一种低损耗低模式串扰渐变型少模光纤
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摘要
提出了一种纯二氧化硅纤芯、渐变折射率分布的两模光纤,实现了渐变折射率少模光纤低差分模式群时延和纯二氧化硅芯光纤低损耗优点的有效结合。采用全矢量有限元方法研究表明,所提出的少模光纤纤芯采用纯二氧化硅实现了低损耗,采用纤芯渐变折射率实现了低差分群延迟,包层处采用凹陷折射率实现了低弯曲损耗,采用模式大折射率差实现了低模式串扰,采用大有效面积实现了低非线性系数;该光纤具有非线性系数和差分模式群时延在1.5～1.65μm波长范围内平坦特性。
A kind of two-mode fiber with pure silica core and graded index is proposed by employing full vector finite element method,which combines the advantages of low differential mode group delay(DMGD) of graded index few-mode fiber and low loss of pure silica core fiber.The proposed few-mode fiber obtains low loss,low DMGD,low bending loss and low mode crosstalk using the methods of pure silica core,graded index,the trench refractive index and large mode refractive index,respectively.Moreover,the nonlinear coefficient and DMGD of the proposed few mode fiber are flattened in the wavelength range of 1.5-1.65 μm.
A kind of two-mode fiber with pure silica core and graded index is proposed by employing full vector finite element method,which combines the advantages of low differential mode group delay(DMGD) of graded index few-mode fiber and low loss of pure silica core fiber.The proposed few-mode fiber obtains low loss,low DMGD,low bending loss and low mode crosstalk using the methods of pure silica core,graded index,the trench refractive index and large mode refractive index,respectively.Moreover,the nonlinear coefficient and DMGD of the proposed few mode fiber are flattened in the wavelength range of 1.5-1.65 μm.
引文
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[2] Li J,Ren F,Hu T,et al.Recent progress in mode-division multiplexed passive optical networks with low modal crosstalk[J].Optical Fiber Technology,2017,35:28-36.
[3] Hei Y,Li L,Li W,et al.Channel estimation in few mode fiber mode division multiplexing transmission system[J].Optical Fiber Technology,2018,41:182-186.
[4] WEN He,ZHENG Hong-jun,MO Qi,et al.Few-mode fibre-optic microwave photonic links,light:science & applications,2017,6(8):e17021.
[5] ZHENG Hong-jun,LI Xin,BAI Cheng-lin.Transmission of chirped pulse in optical fibers,Beijing:Science Press,2018,1:1-184.郑宏军,黎昕,白成林.啁啾脉冲在光纤中的传输,北京:科学出版社,2018,1:1-184.
[6] YU Ru-yuan,ZHENG Hong-jun,LI Xin,et al.A novel three-ring-core few-mode fiber with large effective area and low nonlinear coefficient[J].Optoelectronics Letters,2018,14(1):30-35.
[7] Corsi A,Wang L,Rusch L A,et al.Mode loss measurement in few-mode fibers with a microwave interferometric technique[J].IEEE Photonics Technology Letters,2018,1-1.
[8] Wang T,Shi F,Huang Y,et al.High-order mode direct oscillation of few-mode fiber laser for high-quality cylindrical vector beams[J].Optics Express,2018,26(9):11850-11858.
[9] Pierre Sillard,Marianne Bigot-Astruc,Denis Molin.Few-mode fibers for mode-division-multiplexed systems[J].Journal of Lightwave Technology,2014,32(16):2824-2829.
[10] Kanamori H,Yokota H,Tanaka G,et al.Transmission characteristics and reliability of pure-silica-core single-mode fibers[J].Journal of Lightwave Technology,1986,4(8):1144-1150.
[11] Kato T,Hirano M,Onishi M,et al.Ultra-low nonlinearity low loss pure silica core fiber for long-haul WDM transmission[J].Electronics Letters,1999,35(19):1615-1617.
[12] Nagayama K,Kakui M,Matsui M,et al.Ultra-low-loss(0.148 4 dB/km) pure silica core fiber and extension of transmission distance[J].Electronics Letters,2002,38(20):1168-1169.
[13] Yoshinori Yamamoto,Yuki Kawaguchi,Masaaki Hirano.Low-loss and low-nonlinearity pure-silica-core fiber for C- and L-band broadband transmission[J].J.Lightwave Technol,2016,34(2):321-326.
[14] Sergejs Makovejs,John D.Downie,Jason E.Hurley,et al.Towards superior transmission performance in submarine systems:leveraging ultra-low attenuation and large effective area,J.Lightwave Technol,2016,34:114-120.
[15] Sato K,Maruyama R,Kuwaki N,et al.Optimized graded index two-mode optical fiber with low DMD,large A(eff) and low bending loss[J].Optics Express,2013,21(14):16231-16238.
[16] Ryo Maruyama,Masaharu Ohashi,Kimitaka Watanabe,Nori Shibata,Nobuo Kuwaki,and Shoichiro Matsuo,Study of fabrication reproducibility of two-mode optical fibers for mode division multiplexing with MIMO processing,Opt.Express,2018,26:11100-11109.
[17] Yinping Liu,Lin Ma,Chen Yang,et al.Long-range Raman distributed temperature sensor with high spatial and temperature resolution using graded-index few-mode fiber,Opt.Express,2018,26:20562-20571.
[18] John van Weerdenburg,Roland Ryf,Juan Carlos Alvarado-Zacarias,et al.138-Tb/s Mode- and Wavelength-Multiplexed Transmission Over Six-Mode Graded-Index Fiber,J.Lightwave Technol,2018,36:1369-1374.
[19] Agrawal G P.Nonlinear fiber optics,5e,Elsevier Inc.Elsevier (Singapore) Pte Ltd.1-648(2012).
[20] Zheng H,Liu S.Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission[J].Chinese Optics Letters,2008,6(7):533-535.
[21] Li M J,Hoover B,Li S P,et al.Opto-electronics and communications conference,495 (2012).