The wide field-of-view(FOV) optical receiver has many advantages in optical wireless communication,sensing and detection.However,the FOV is limited by some tradeoffs of the receiver's components employing conventi...The wide field-of-view(FOV) optical receiver has many advantages in optical wireless communication,sensing and detection.However,the FOV is limited by some tradeoffs of the receiver's components employing conventional optical devices.Furthermore,present mechanisms to extend the FOV are not effective.To realize the wide FOV receiver effectively,we propose surface plasmon polaritons(SPPs) as the potential candidate.Two examples are presented to lively illustrate SPPs' striking power to offer unexpected solutions to conventional problems.It is shown that unusual conditions should be explored to make use of SPPs under some circumstances.Excitations of localized SPPs,which are independent of the incidence angle,are suggested as the mechanism for the wide FOV receiver.Some progress in the optimization of SPPs' excitation at oblique incidence is also reported.展开更多
为了降低自由空间激光通信中对准难度,本文提出了采用离焦的方法以增大接收视场角。以满足通信所需最低能量(-35 d Bm)为基准,理论推导了探测器接收能量、接收视场角(FOV)、离焦接收能量及离焦量之间的相互关系,并通过Matlab仿真,分析...为了降低自由空间激光通信中对准难度,本文提出了采用离焦的方法以增大接收视场角。以满足通信所需最低能量(-35 d Bm)为基准,理论推导了探测器接收能量、接收视场角(FOV)、离焦接收能量及离焦量之间的相互关系,并通过Matlab仿真,分析对比了离焦接收能量和离焦量对接收视场角的影响。结果显示,当离焦量为0.5 mm时,离焦接收能量从-20.9 d Bm提高到-4.1 d Bm,接收视场角能增大0.27 mrad;当离焦接收能量为-4.1 d Bm时,离焦量从0.2 mm扩大到1.0 mm,视场角能增大1.75 mrad。通过对比表明,提高离焦接收能量以及扩大离焦量都可以增加接收视场角,且扩大离焦量的效果相对比较明显,这对后续离焦系统的设计提供了理论指导依据。展开更多
针对室内可见光通信系统的传统光学接收天线无法同时满足高增益和大视场的问题,设计了一种二级级联式光学天线.通过分析信噪比、通信速率与接收天线视场角的关系,发现视场角为40?—60?的光学天线最适用于室内可见光通信系统.通过光学仿...针对室内可见光通信系统的传统光学接收天线无法同时满足高增益和大视场的问题,设计了一种二级级联式光学天线.通过分析信噪比、通信速率与接收天线视场角的关系,发现视场角为40?—60?的光学天线最适用于室内可见光通信系统.通过光学仿真软件Trace Pro的模拟及计算,给出了所设计的二级级联式光学天线的增益随信号光入射角的变化关系.结果表明,相较于传统接收天线,二级级联式光学天线具有更好的光学性能,视场角为菲涅耳透镜单独接收时的4倍.利用Matlab对二级级联式光学天线竖直向上时的接收功率分布进行仿真,结果显示探测器接收到的信号功率提升效果明显,平均值较直接探测时增大了7 d Bm,进一步证实该二级级联式光学天线适用于室内可见光通信系统.展开更多
基金Supported by the National Natural Science Foundation of China (Grant No.60772002)
文摘The wide field-of-view(FOV) optical receiver has many advantages in optical wireless communication,sensing and detection.However,the FOV is limited by some tradeoffs of the receiver's components employing conventional optical devices.Furthermore,present mechanisms to extend the FOV are not effective.To realize the wide FOV receiver effectively,we propose surface plasmon polaritons(SPPs) as the potential candidate.Two examples are presented to lively illustrate SPPs' striking power to offer unexpected solutions to conventional problems.It is shown that unusual conditions should be explored to make use of SPPs under some circumstances.Excitations of localized SPPs,which are independent of the incidence angle,are suggested as the mechanism for the wide FOV receiver.Some progress in the optimization of SPPs' excitation at oblique incidence is also reported.
文摘为了降低自由空间激光通信中对准难度,本文提出了采用离焦的方法以增大接收视场角。以满足通信所需最低能量(-35 d Bm)为基准,理论推导了探测器接收能量、接收视场角(FOV)、离焦接收能量及离焦量之间的相互关系,并通过Matlab仿真,分析对比了离焦接收能量和离焦量对接收视场角的影响。结果显示,当离焦量为0.5 mm时,离焦接收能量从-20.9 d Bm提高到-4.1 d Bm,接收视场角能增大0.27 mrad;当离焦接收能量为-4.1 d Bm时,离焦量从0.2 mm扩大到1.0 mm,视场角能增大1.75 mrad。通过对比表明,提高离焦接收能量以及扩大离焦量都可以增加接收视场角,且扩大离焦量的效果相对比较明显,这对后续离焦系统的设计提供了理论指导依据。
文摘针对室内可见光通信系统的传统光学接收天线无法同时满足高增益和大视场的问题,设计了一种二级级联式光学天线.通过分析信噪比、通信速率与接收天线视场角的关系,发现视场角为40?—60?的光学天线最适用于室内可见光通信系统.通过光学仿真软件Trace Pro的模拟及计算,给出了所设计的二级级联式光学天线的增益随信号光入射角的变化关系.结果表明,相较于传统接收天线,二级级联式光学天线具有更好的光学性能,视场角为菲涅耳透镜单独接收时的4倍.利用Matlab对二级级联式光学天线竖直向上时的接收功率分布进行仿真,结果显示探测器接收到的信号功率提升效果明显,平均值较直接探测时增大了7 d Bm,进一步证实该二级级联式光学天线适用于室内可见光通信系统.
