一种40 Gbit/s QSFP+并行光模块光路设计
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摘要
大容量光通信设备驱使光模块向低成本、高速率、高集成方向发展。提出一种40 Gbit/s QSFP+并行光模块的新型光路结构设计。采用圆柱透镜替换传统微透镜阵列,通过透镜耦合原理及重叠积分法计算VCSEL与多模光纤的耦合效率;利用MATLAB计算得到透镜与VCSEL最佳耦合距离,在ZEMAX非序列模式下完成了光路建模。仿真表明,激光器与透镜间的距离为0. 077 mm时有最佳解,耦合效率达到81%。考虑生产中可能存在的误差,利用LightTools分析了轴向偏移、间隙偏移、角度偏移对耦合效率的影响,得出各偏移量的容忍度,为自动化生产提供了理论支持。该结构减少了光信号入纤前的损耗,有利于模块封装微小化及降低成本,可作为未来光模块大批量生产的备选方案。
High-capacity optical communication equipment drives optical modules to develop in the direction with low cost,high speed,and high integration. Therefore,this article proposed a new structural design of optical paths for40 Gbit/s Quad Small Form-factor Pluggable Plus( QSFP +) parallel optical module. Cylindrical lens was used to replace the traditional micro lens array,the coupling efficiency between Vertical Cavity Surface Emitting Laser( VCSEL)and multimode fiber can be calculated by lens-coupling principle and the method of overlap integral. The optimal coupling distance between the lens and VCSEL were be obtained by MATLAB,and the optical paths were presented under the non-sequential mode in ZEMAX. The result of simulation shows that the optimal solution can be obtained when the distance between the laser and the lens is 0. 077 millimeter,and the coupling efficiency is 81%. To take the errors of production into consideration,the tolerance of each offset can be obtained with analyzing the influence of axial offset,gap offset and angular offset on coupling efficiency by LightTools,which provides the theoretical support for automatic production. The structure can reduce the loss of the optical signal before inserted into the fiber,which is beneficial to the miniaturization of the module package and the cost reduction,and can be used as an alternative for mass production of the optical module in the future.
High-capacity optical communication equipment drives optical modules to develop in the direction with low cost,high speed,and high integration. Therefore,this article proposed a new structural design of optical paths for40 Gbit/s Quad Small Form-factor Pluggable Plus( QSFP +) parallel optical module. Cylindrical lens was used to replace the traditional micro lens array,the coupling efficiency between Vertical Cavity Surface Emitting Laser( VCSEL)and multimode fiber can be calculated by lens-coupling principle and the method of overlap integral. The optimal coupling distance between the lens and VCSEL were be obtained by MATLAB,and the optical paths were presented under the non-sequential mode in ZEMAX. The result of simulation shows that the optimal solution can be obtained when the distance between the laser and the lens is 0. 077 millimeter,and the coupling efficiency is 81%. To take the errors of production into consideration,the tolerance of each offset can be obtained with analyzing the influence of axial offset,gap offset and angular offset on coupling efficiency by LightTools,which provides the theoretical support for automatic production. The structure can reduce the loss of the optical signal before inserted into the fiber,which is beneficial to the miniaturization of the module package and the cost reduction,and can be used as an alternative for mass production of the optical module in the future.
引文
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[2] KUN YANG,ZHIHUA LIA. 10-Gbps x 12-Channel Pluggable Parallel Optical Transceiver Based on CXP Interface Specifications[J]. Fiber and Integrated Optics,2012,31:164-177.
[3]杨坤.基于CXP接口规格的10Gbit/s×12通道并行光收发器[D].中国科学院研究生院,2012.
[4] SANGIROV JAMSHID,JOO GWAN-CHONG,CHOI JAESHIK. 40 Gb/s optical subassembly module for a multichannel bidirectional optical link[J].Optics express,2014,222:1770-1783.
[5]胡伟,周本军,等. 120Gbit/s甚短距离并行光模块的研制[J].半导体光电,2015,6(32):964-967.
[6]张雪芹,周本军,胡伟等. 40Gbit/多路并行光收发模块的研制[J].半导体光电,2017,38(1):94-97.
[7]石科仁,朱长青.基于ZEMAX的激光与多模光纤耦合系统设计[J].光通信技术,2016,40(05):43-45.
[8]孙舒娟,郭林辉,谭昊,等.半导体激光器波分复用合束技术研究进展[J].激光与光电子学进展,2018,55(02):18-27.
[9]崔锦江,董宁宁,徐建根,等.垂直腔面发射半导体激光器单管的光束质量研究[J].中国激光,2015(b09):39-45.
[10] ZHANG J,CHEN Y Y,LI Q,et al.Advances in high power high beam quality diode lasers[J]. Chinese Science Bulletin,2017,62(32); 3719-3728.
[11] AN H,XIONG Y,JIANG C L J,et al.Methods for slow axis beam quality improvementof high power broad area diode lasers[J]. Proceedings of SPIE-The International Society for Optical Engineering,2014,8965:89650U-89650U-8.
[12] HAAS M,RAUCH S,NAGEL S,et al.Beam Quality Deterioration in Dense Wavelength Beam-Combined Broad-Area Diode Lasers[J]. IEEE Journal of Quantum Electronics,2017,53(3):1-11.
[13]王晓薇,肖建伟,马骁宇,等.激光二极管线列阵与多模光纤列阵的光纤耦合[J].半导体学报,2002,(5):464-467.
[14] LIU Y Y,LIU R C,CHEN X.Slant-Face Fiber Side Coupling of Vertical Cavity Surface Emitting Laser[J]. Applied Mechanics&Materials,2014,509:155-158.
[15] S.BASKAL,Y.S.KIM.Lens optics and the continuity problems of the ABCD matrix[J]. Journal of Modern Optics,2014,61(2):161-166.
[16]陈希.多通道并行光模块的结构设计与性能仿真[D].华中科技大学,2016.
[17] HEINRICH J,ZEEB E,EBELING K J.Butt-coupling efficiency of VCSELs into multimode fibers[J].IEEE Photonics Technology Letters,1997,9(12):1555-1557.
[18]阎嫦玲,鲁平,刘德明,向思桦.与光纤阵列耦合的微透镜阵列设计与损耗分析[J].光电子·激光,2006(09):1043-1047.
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