[1] Mukasa K, Imamura K, Tsuchida Y et al. Multi-core fibers for large capacity SDM. [C]∥Optical Fiber Communication Conference 2011, March 6-10, 2011, Los Angeles, California. Washington D. C.: OSA, OWJ1(2011).

     Mukasa K, Imamura K, Tsuchida Y et al. Multi-core fibers for large capacity SDM. [C]∥Optical Fiber Communication Conference 2011, March 6-10, 2011, Los Angeles, California. Washington D. C.: OSA, OWJ1(2011).

[2] Mumtaz S, Essiambre R J, Agrawal G P. Nonlinear propagation in multimode and multicore fibers: generalization of the Manakov equations[J]. Journal of Lightwave Technology, 31, 398-406(2013). http://www.opticsinfobase.org/jlt/abstract.cfm?uri=jlt-31-3-398

     Mumtaz S, Essiambre R J, Agrawal G P. Nonlinear propagation in multimode and multicore fibers: generalization of the Manakov equations[J]. Journal of Lightwave Technology, 31, 398-406(2013). http://www.opticsinfobase.org/jlt/abstract.cfm?uri=jlt-31-3-398

[3] Gaur A, Rastogi V. Modal gain equalization of 18 modes using a single-trench ring-core EDFA[J]. Journal of the Optical Society of America B, 35, 2211-2216(2018). http://www.onacademic.com/detail/journal_1000040493094710_1bb4.html

     Gaur A, Rastogi V. Modal gain equalization of 18 modes using a single-trench ring-core EDFA[J]. Journal of the Optical Society of America B, 35, 2211-2216(2018). http://www.onacademic.com/detail/journal_1000040493094710_1bb4.html

[4] Li J X, Wang L L, Du J B et al. Experimental demonstration of a few-mode Raman amplifier with a flat gain covering 1530-1605 nm[J]. Optics Letters, 43, 4530-4533(2018).

     Li J X, Wang L L, Du J B et al. Experimental demonstration of a few-mode Raman amplifier with a flat gain covering 1530-1605 nm[J]. Optics Letters, 43, 4530-4533(2018).

[5] Guo C, Zhang Z Z, Zhao N B et al. Design of elliptical-core few-mode fibers for optical parametric amplification. [C]∥Optical Fiber Communication Conference 2017, March 19-23, 2017, Los Angeles, California, United States. Washington D. C.: OSA, W2A, 20(2017).

     Guo C, Zhang Z Z, Zhao N B et al. Design of elliptical-core few-mode fibers for optical parametric amplification. [C]∥Optical Fiber Communication Conference 2017, March 19-23, 2017, Los Angeles, California, United States. Washington D. C.: OSA, W2A, 20(2017).

[6] Nazemosadat E, Lorences-Riesgo A, Karlsson M et al. Design of highly nonlinear few-mode fiber for C-band optical parametric amplification[J]. Journal of Lightwave Technology, 35, 2810-2817(2017). http://ieeexplore.ieee.org/document/7929269

     Nazemosadat E, Lorences-Riesgo A, Karlsson M et al. Design of highly nonlinear few-mode fiber for C-band optical parametric amplification[J]. Journal of Lightwave Technology, 35, 2810-2817(2017). http://ieeexplore.ieee.org/document/7929269

[7] Parmigiani F, Jung Y, Horak P et al. C- to L- band wavelength conversion enabled by parametric processes in a few mode fiber. [C]∥Optical Fiber Communication Conference 2017, March 19-23, 2017, Los Angeles, California, United States. Washington D. C.: OSA, Th1F, 4(2017).

     Parmigiani F, Jung Y, Horak P et al. C- to L- band wavelength conversion enabled by parametric processes in a few mode fiber. [C]∥Optical Fiber Communication Conference 2017, March 19-23, 2017, Los Angeles, California, United States. Washington D. C.: OSA, Th1F, 4(2017).

[8] Cao H. Theoretical and experimental study on fiber optical parametric amplifiers[D]. Wuhan: Huazhong University of Science and Technology, 11-20(2006).

     Cao H. Theoretical and experimental study on fiber optical parametric amplifiers[D]. Wuhan: Huazhong University of Science and Technology, 11-20(2006).

[9] Mao X R, Kou Z F, Zhang J H. Two improved methods of suppression four wave mixing effect in optical fiber transmission[J]. Laser & Optoelectronics Progress, 54, 080601(2017).

     Mao X R, Kou Z F, Zhang J H. Two improved methods of suppression four wave mixing effect in optical fiber transmission[J]. Laser & Optoelectronics Progress, 54, 080601(2017).

[10] Yuan H, Wu B J, Zhou X Y et al. Equalization and regeneration of four-wave mixing for time-interleaved channel[J]. Acta Optica Sinica, 34, 0206002(2014).

     Yuan H, Wu B J, Zhou X Y et al. Equalization and regeneration of four-wave mixing for time-interleaved channel[J]. Acta Optica Sinica, 34, 0206002(2014).

[11] Cao Y M, Wu B J, Wan F et al. Principle and noise performance of optical phase arithmetic devices using four wave mixing[J]. Acta Physica Sinica, 67, 094208(2018).

     Cao Y M, Wu B J, Wan F et al. Principle and noise performance of optical phase arithmetic devices using four wave mixing[J]. Acta Physica Sinica, 67, 094208(2018).

[12] Xiao Y Z, Essiambre R J, Desgroseilliers M et al. Theory of intermodal four-wave mixing with random linear mode coupling in few-mode fibers[J]. Optics Express, 22, 32039-32059(2014). http://www.ncbi.nlm.nih.gov/pubmed/25607171

     Xiao Y Z, Essiambre R J, Desgroseilliers M et al. Theory of intermodal four-wave mixing with random linear mode coupling in few-mode fibers[J]. Optics Express, 22, 32039-32059(2014). http://www.ncbi.nlm.nih.gov/pubmed/25607171

[13] Bebawi J, Kandas I, El-Osairy M et al. A comprehensive study on EDFA characteristics: temperature impact[J]. Applied Sciences, 8, 1640(2018).

     Bebawi J, Kandas I, El-Osairy M et al. A comprehensive study on EDFA characteristics: temperature impact[J]. Applied Sciences, 8, 1640(2018).

[14] Nazemosadat E, Pourbeyram H, Mafi A. Phase matching for spontaneous frequency conversion via four-wave mixing in graded-index multimode optical fibers[J]. Journal of the Optical Society of America B, 33, 144-150(2016). http://www.opticsinfobase.org/abstract.cfm?uri=josab-33-2-144

     Nazemosadat E, Pourbeyram H, Mafi A. Phase matching for spontaneous frequency conversion via four-wave mixing in graded-index multimode optical fibers[J]. Journal of the Optical Society of America B, 33, 144-150(2016). http://www.opticsinfobase.org/abstract.cfm?uri=josab-33-2-144

[15] Liu Y L. Parameters optimization and the crosstalk characteristics research in optical parametric amplifier[D]. Chengdu: Southwest Jiaotong University, 6-18(2015).

     Liu Y L. Parameters optimization and the crosstalk characteristics research in optical parametric amplifier[D]. Chengdu: Southwest Jiaotong University, 6-18(2015).

[16] Liu Q, Bi W H, Wang S W et al. Few-mode fiber temperature sensor based on interference between LP01 and LP11 modes[J]. Acta Optica Sinica, 38, 0206001(2018).

     Liu Q, Bi W H, Wang S W et al. Few-mode fiber temperature sensor based on interference between LP01 and LP11 modes[J]. Acta Optica Sinica, 38, 0206001(2018).

[17] Xu Z. Control the orbital angular momentum in third-harmonic generation using quasi-phase-matching[D]. Nanjing: Nanjing University, 5-27(2018).

     Xu Z. Control the orbital angular momentum in third-harmonic generation using quasi-phase-matching[D]. Nanjing: Nanjing University, 5-27(2018).

[18] Essiambre R J, Mestre M A, Ryf R et al. Experimental investigation of inter-modal four-wave mixing in few-mode fibers[J]. IEEE Photonics Technology Letters, 25, 539-542(2013). http://ieeexplore.ieee.org/document/6422325/

     Essiambre R J, Mestre M A, Ryf R et al. Experimental investigation of inter-modal four-wave mixing in few-mode fibers[J]. IEEE Photonics Technology Letters, 25, 539-542(2013). http://ieeexplore.ieee.org/document/6422325/