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1. 发明申请

WO2009081237A1 METHOD AND DEVICE FOR POLARIZATION STABILIZATION OF AN OPTICAL RADIATION 审中-公开
标题翻译：用于偏光稳定的光学辐射的方法和装置
公开(公告)号：WO2009081237A1
公开(公告)日：2009-07-02
申请号：PCT/IB2007/055292
申请日：2007-12-21
申请人： PGT PHOTONICS S.P.A. , MARTELLI, Paolo , MARTINELLI, Mario , RIGHETTI, Aldo
发明人： MARTELLI, Paolo , MARTINELLI, Mario , RIGHETTI, Aldo
IPC分类号： H04J14/06 , G02F1/01 , G02B27/28
CPC分类号： H04J14/06 , G02B5/3083 , G02F1/0121 , G02F1/0136
摘要： A method of stabilizing the state of polarization of an optical radiation comprises: 1) applying sequentially to the optical radiation a first and a second controllable phase retardation; 2) detecting an optical power of at least a first polarized portion of the optical radiation obtained after step 1; 3) applying sequentially to the optical radiation obtained after step 1 a third and a fourth controllable phase retardation; 4) detecting an optical power of a further polarized portion of the optical radiation obtained after step 3; 5) controlling, responsive to the optical power of said first polarized portion, the second controllable phase retardation so as to maintain the polarization state of the optical radiation obtained after step 1 at a defined great circle r on a Poincare sphere; 6) in case the second controllable phase retardation reaches a first limit value, commuting the first controllable phase retardation between first and second values; 7) controlling, responsive to the optical power of said further polarized portion, the fourth controllable phase retardation so as to maintain the polarization state of the optical radiation obtained after step 3 at a defined state of polarization; 8) in case the fourth controllable phase retardation reaches a second limit value, commuting the third controllable phase retardation between third and fourth values, keeping constant the first controllable phase retardation while the third controllable phase retardation is commuting between said third and fourth values. A polarization stabilizing device based on the method above is also disclosed.
摘要翻译：稳定光辐射的偏振状态的方法包括：1）顺序地施加到光辐射第一和第二可控相位延迟; 2）检测在步骤1之后获得的光辐射的至少第一极化部分的光功率; 3）顺序地施加到在步骤1之后获得的光辐射，第三和第四可控相位延迟; 4）检测在步骤3之后获得的光辐射的另一极化部分的光功率; 5）响应于所述第一极化部分的光功率控制第二可控相位延迟，以便将在步骤1之后获得的光辐射的极化状态保持在庞加莱球上的限定的大圆圈r; 6）在第二可控相位延迟达到第一极限值的情况下，使第一和第二值之间的第一可控相位延迟相乘; 7）响应于所述另外的偏振部分的光焦度来控制第四可控相位延迟，以便将在步骤3之后获得的光辐射的偏振状态保持在限定的偏振状态; 8）在第四可控相位延迟达到第二极限值的情况下，使第三和第四值之间的第三可控相位延迟相交，在第三可控相位延迟在所述第三和第四值之间通勤时，保持第一可控相位延迟恒定。还公开了一种基于上述方法的偏振稳定装置。

2. 发明申请

WO2009071964A1 SYSTEM AND METHOD FOR COHERENT DETECTION OF OPTICAL SIGNALS 审中-公开
标题翻译：用于光信号的相关检测的系统和方法
公开(公告)号：WO2009071964A1
公开(公告)日：2009-06-11
申请号：PCT/IB2007/054948
申请日：2007-12-06
申请人： PGT PHOTONICS S.P.A. , BOFFI, Pierpaolo , MARAZZI, Lucia , MARTELLI, Paolo , PAROLARI, Paola , RIGHETTI, Aldo
发明人： BOFFI, Pierpaolo , MARAZZI, Lucia , MARTELLI, Paolo , PAROLARI, Paola , RIGHETTI, Aldo
IPC分类号： H04B10/148
CPC分类号： H04B10/6161 , H04B10/61 , H04B10/6162 , H04B10/63 , H04B10/64
摘要： An optical communication system (100; 2300) comprises at least a transmitter (110) apt to emit a differential phase shift keying (DPSK) optical signal having a bit-rate equal to R, at least a receiving system (1200) for receiving the differential phase shift keying optical signal; and an optical link (130) optically connecting the transmitter and the receiving system for transmitting the DPSK optical signal from the transmitter to the receiving system, wherein the receiving system comprises a coherent optical receiving device (1205) apt to coherently receive the propagated DPSK optical signal and to emit at least one electrical signal (I) related to the received DPSK optical signal, and wherein the receiving system further comprises at least one electrical filter (270) for filtering the at least one electrical signal and having -3dB double-side bandwidth greater than or equal to 0.44R and lower than or equal to 0.68R, and at least one squarer (280) for squaring the at least one filtered electrical signal. A related method for optical communication is also disclosed.
摘要翻译：光通信系统（100; 2300）至少包括一个适于发射具有等于R的比特率的差分相移键控（DPSK）光信号的发射机（110），至少一接收系统（1200）差分相移键控光信号; 以及光链路（130），其将所述发射机和所述接收系统光学连接，用于将所述DPSK光信号从所述发射机发射到所述接收系统，其中，所述接收系统包括相干光接收装置（1205），所述相干光接收装置适于相干地接收所传播的DPSK光信号并且发射与所接收的DPSK光信号相关的至少一个电信号（I），并且其中所述接收系统还包括用于对所述至少一个电信号进行滤波并具有-3dB双侧的至少一个电滤波器（270）带宽大于或等于0.44R且低于或等于0.68R，以及至少一平方（280）用于平坦化所述至少一个滤波后的电信号。还公开了一种用于光通信的相关方法。

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