高速率并行光发射模块的研制

介绍了有关并行光发射模块设计与制作的最新进展,制作并测试了12信道并行光发射模块,单信道传输速率大于2．5Gbit／s（最高可达3Gbit／s）,12信道并行总传输速率为30Gbit／s。模块采用波长为850nm的垂直腔面发射激光器（VCSEL）作光源,激光器与驱动电路芯片直接用Au丝连接,输出光束直接耦合进入12信道的光纤阵列中,在单信道8mA的工作电流下,可以测到最高为3Gbit／s的清晰眼图。     

37.5Gbit/s并行光发射模块的研制

制作并测试了12信道总传输速率为37.5Gbit/s的高速并行光发射模块,其中单信道传输速率为3.125Gbit/s.模块采用波长为850nm的垂直腔面发射激光器(VCSEL)作为光源.耦合过程采用了一种利用倒装焊设备进行激光器阵列与列阵光纤之间的无源对准耦合的方法.在单信道8mA的工作电流下,可以得到3.125Gbit/s的清晰眼图.     

37.5Gbit/s并行光发射模块的研制

制作并测试了12信道总传输速率为37.5Gbit/s的高速并行光发射模块,其中单信道传输速率为3.125Gbit/s.模块采用波长为850nm的垂直腔面发射激光器(VCSEL)作为光源.耦合过程采用了一种利用倒装焊设备进行激光器阵列与列阵光纤之间的无源对准耦合的方法.在单信道8mA的工作电流下,可以得到3.125Gbit/s的清晰眼图.     

40Gbit/s甚短距离并行光发送模块的研制

基于VCSEL激光器阵列,设计和制作了一种12信道的40 Gbit/s甚短距离并行光发送模块。模块单信道传输速率大于3.5 Gbit/s,12信道并行总传输速率高达40 Gbit/s。并行光发送模块以其高速率、高集成度以及低成本等特点,为短距离高速率并行光传输提供最具竞争力的解决方案之一。     

40Gbit／s高速并行12信道光接收模块的研制

研究并制作了12信道并行光接收模块,单信道传输速率大于等于3．318Gbit／s,12信道并行总传输速率为40Gbit／s。模块采用工作波长在850nm的高速PIN型光电探测器（PD）列阵作为光接收器件,PD列阵与接收电路芯片直接用Au丝压焊连接,输入光信号直接由12信道的光纤阵列耦合进入PD列阵中。对光接收模块进行眼...     

10Gbit/s甚短距离并行光传输模块研究

本文讨论了符合OIF-VSR4-01.0规范的10Gbit/s 甚短距离(VSR)并行光传输模块实验系统、转换集成电路、12通道850nm垂直腔面发射激光器(VCSEL)并行光发射模块、12通道并行光接收模块中的12通道前端放大电路的实现,并给出了系统测试方案和测试结果。测试结果表明,转换集成电路数字逻辑部分的全部功能用FPGA实现,研制的12通道并行光发射模块传输带宽达12?.244Gbit/s。在点到点的传输测试中,采用12芯400MHz-km 62.5靘多模带状光纤时,传输距离达302米,系统误码率低于1?0-13,12通道前端放大电路单路工作速率达1.25Gbit/s。     

10Gbit/s甚短距离并行光传输模块与实验系统

介绍符合OIF-VSR4-03.0规范的10Gbit/s甚短距离(VSR)实验系统研究.该系统由16×622Mbit/s到4×2.488Gbit/s转换集成电路、自制12通道850nm垂直腔面发射激光器(VCSEL)并行光发射模块和商用12通道并行接收光模块构成.用一片FPGA实现转换芯片的全部功能,采用基于二分查找法的SDH STM-64/OC192 并行帧对齐及同步算法,大大提高了转换芯片的工作速度和节省了逻辑资源,自制12通道VCSEL并行发射模块工作速率达到12×2.488Gbit/s的设计指标.在SDH STM-64/OC192 10Gbit/s测试仪点到点的传输系统测试中,采用5米的12芯400MHz·km 62.5μm多模带状光纤互联,系统误码率低于1×10^-14.     

120Gbit/s甚短距离并行光模块的研制

基于12通道垂直腔面发射激光器(VCSEL)阵列和12通道PD探测器阵列,设计制作了120 Gbit/s甚短距离的12通道并行光发送模块和12通道并行光接收模块.基于电磁场、传输线理论的信号完整性设计,减小了通道间串扰;利用过孔模型分析和阻抗设计,解决信号反射问题;且通过减小金丝直连长度等手段增加了通道带宽.光模块单通道传输速率不小于10Gbit/s,12通道并行总传输速率高达120 Gbit/s.并行光模块具有高速率、高集成度以及低成本等特点,为短距离高速率并行光传输系统提供具竞争力的解决方案.     

40 Gbit/s多路并行光收发模块的研制

基于VCSEL激光器阵列和PIN探测器阵列,设计和制作了40Gbit/s甚短距离的4通道发射4通道接收并行光收发模块.通过高速电路信号仿真设计,解决了信号完整性、串扰和电磁兼容等问题;通过键合金丝长度设计增加了通道带宽.光模块单通道传输速率可达到5 Gbit/s,8通道并行总传输速率达到40Gbit/s,实现了并行光收发模块高速率、高密度、高可靠性以及小体积设计,为甚短距离高速数据处理和传输提供了高可靠的多路数据链接.     

竖直腔面发射激光器阵列

美国新墨西哥州的EMCORE公司生产的1×12竖直腔面发射激光器阵列波长为850 nm,这种激光器可用于千兆比特数字化通信和远距离通信开关。这种激光器还可用于并行光线路,信息传输速度为15 Gbit/s。(No.32)竖直腔面发射激光器阵列~~     

10Gbit／sX4小型可插拔并行光收发模块的研制

研制了一款基于系统级封装技术的低成本、收发一体和可带电热插拔的4通道小型可插拔（QSFP）光模块,采用850nm垂直腔面发射激光器（VCSEL）阵列及其驱动器作为发射端,光电探测器（PD）阵列及其跨阻放大器（TIA）作为接收端,通过光路无源对准,实现了低成本光互连。高速度、高密度封装下的瞬态同步开关噪声、芯片间电磁干扰...     

Packaging for a 40-channel parallel optical interconnection modulewith an over-25-Gbit/s throughput

NTT is currently working on developing a high-throughput interconnection module that is both compact and cost effective. The technology being developed is called “parallel inter-board optical interconnection technology”, or “ParaBIT”. The ParaBIT module that has been developed is the first step; it is a front-end module with 40 channels, a throughput of over 25 Gbit/s, and a transmission distance of over 100 m along multimode fibers. One major feature of this module is the use of vertical-cavity surface-emitting laser (VCSEL) arrays as very cost-effective light sources. These arrays enable the same packaging structure to be used for both the transmitter and receiver. To achieve super-multichannel performance, high-density multiport bare-fiber (BF) connectors were developed for the module's optical interface. Unlike conventional optical connectors, these BF connectors do not need a ferrule or spring. This ensures physical contact with an excellent insertion loss (less than 0.1 dB per channel). A polymeric optical waveguide film with a 45° mirror for coupling to the VCSEL and photo-diode (PD) arrays by passive optical alignment was also developed. To facilitate coupling between the VCSEL/PD array chips and the waveguide, a packaging technique was developed to align and die bond the optical array chips on a substrate. This technique is called transferred multichip bonding (TMB); it can be used to mount optical array chips on a substrate with a positioning error of only several micrometers. These packaging techniques enabled ultra-parallel interconnections to be achieved in prototype ParaBIT modules     

用于空间光互连的850 nm VCSEL 4×4阵列的热场模拟

作为空间光互连系统的发射部分,垂直腔表面发射激光器(VCSEL)阵列的热特性直接影响到光互连系统的稳定性。建立了850nm VCSEL 4×4阵列的热场数学模型,并利用有限差分法求解热传导和热扩散方程,得出了在VCSEL单元工作电流为10mA时阵列的热场分布:VCSEL单元有源层温度约为50℃;整个阵列的温度仅为38.65℃。依据此结果制作了850nm 4×4光互连模块,其每通道稳定传输速率达到1Gbit/s。     

Parallel optical transmitter module using angled fibers and a V-grooved silicon optical bench for VCSEL array

We propose an advanced structure of optical subassembly (OSA) for packaging of the vertical-cavity surface-emitting laser (VCSEL) array, using (111) facet mirror of the V-groove ends formed in a silicon optical bench (SiOB) and angled fiber apertures. The feature of our OSA can provide a low optical crosstalk between neighboring channels, a low feedback reflection, and a large misalignment tolerance along the V-groove. We describe the optimized design of fiber angle, VCSEL position, and fiber position. The fabricated OSA structure consists of 12 channels of angled fiber array, 54.7/spl deg/ V-grooves, Au-coated mirrors on (111) end facet of the V-grooves, and flip-chip-bonded VCSEL array on a SiOB. In this structure, the beam emitted from the VCSEL is deflected at the 54.7/spl deg/ mirror of (111) end facet and propagated into the angled fiber. The angled fiber array was polished by 57/spl deg/. Fabricated OSAs showed a coupling efficiency of 30%-50% that is 25 times larger than that obtained from an OSA with a vertically flat fiber array. Our OSA showed large misalignment tolerance of about 90 /spl mu/m along the longitudinal direction in the V-groove. We fabricated a parallel optical transmitter module using the OSA and demonstrated 12 channels /spl times/2.5 Gb/s data transmission with a clear eye diagram.     

Packaging of optoelectronic and RF components with shared elements for dual-mode wireless communications

The development of a new hybrid packaging method is reported, where the front end radio frequency (RF) element, namely a modified quasi-Yagi antenna, is integrated with an optical transmitter and an optical receiver on single PCB for dual-mode, i.e. RF/free space optical communication. The VCSEL and the pin diode are placed on the antenna directors to share the common metal pads on the Duroid (RT 6010) board. The modules have demonstrated dual-mode wireless communication capability, i.e. RF and free space optics. Though the RF channel induces noise to the optical transmitter/receiver due to electromagnetic coupling between closely-spaced RF and optical circuits, a data rate of 2.5 Gbit/s is demonstrated for the optical channel.     

1.6 Tbit/s(40×40 Gbit/s)光通信传输系统

在国家自然科学基金网(NSFCNet)上已实现由400 km×10 Gbit/s传输链路直接升级的一路400 km×40 Gbit/s光传输实验的基础上,采用自行研制的40×40 Gbit/s载波抑制归零(CS-RZ)码多波长光发送源,进行了160 km的1.6 Tbit/s(40×40 Gbit/s)波分复用(WDM)光传输实验。实验结果表明,对于常规中短距离10 Gbit/s传输链路可以直接升级至40 Gbit/s。但是由于40 Gbit/s传输系统的色散容限小于60 ps/nm,而且传输光纤与色散补偿模块的色散斜率不匹配,要实现40通道40 Gbit/s的传输,必须对40个信道分别进行精细的色散补偿。这也说明,对于宽带的40 Gbit/s多波长系统,有必要优化设计或更新传输链路。