公开(公告)号：EP0856943A3

公开(公告)日：2000-01-05

申请号：EP98300732.9

申请日：1998-02-02

申请人： TEKTRONIX, INC.

发明人： Anderson, Duwayne R.

IPC分类号： H03G3/30 ,  H03G1/00

CPC分类号： H03G1/0047 ,  H03G3/24

摘要： An active avalanche photo-diode, APD, gain control circuit for use in an optical receiver includes a bias generator for varying the bias on a variable gain APD in response to bias control values generated by a controller. The controller receives the output of the optical receiver and determines the system noise of the receiver for the various bias control values. The system noise is compared to a threshold value for establishing the optimum bias for optimum gain of the APD. The gain control circuit is useable in an optical receiver in an optical time domain reflectometer, OTDR, for increasing the dynamic range of the OTDR.

公开(公告)号：EP0856943A2

公开(公告)日：1998-08-05

申请号：EP98300732.9

申请日：1998-02-02

申请人： TEKTRONIX, INC.

发明人： Anderson, Duwayne R.

IPC分类号： H03G3/30 ,  H03G1/00

CPC分类号： H03G1/0047 ,  H03G3/24

摘要： An active avalanche photo-diode, APD, gain control circuit for use in an optical receiver includes a bias generator for varying the bias on a variable gain APD in response to bias control values generated by a controller. The controller receives the output of the optical receiver and determines the system noise of the receiver for the various bias control values. The system noise is compared to a threshold value for establishing the optimum bias for optimum gain of the APD. The gain control circuit is useable in an optical receiver in an optical time domain reflectometer, OTDR, for increasing the dynamic range of the OTDR.

摘要翻译： 用于光接收机的主动雪崩光电二极管APD增益控制电路包括偏置发生器，用于响应于由控制器产生的偏置控制值来改变可变增益APD上的偏置。 控制器接收光接收器的输出，并确定接收机的各种偏置控制值的系统噪声。 将系统噪声与阈值进行比较，以建立APD的最佳增益的最佳偏置。 增益控制电路可用于光时域反射计OTDR中的光接收机，用于增加OTDR的动态范围。

公开(公告)号：EP1365218A2

公开(公告)日：2003-11-26

申请号：EP03253114.7

申请日：2003-05-19

申请人： Tektronix, Inc.

发明人： Anderson, Duwayne R.

IPC分类号： G01J9/00

CPC分类号： G01J9/00 ,  G01J9/0246 ,  G01J2003/2866 ,  H01S3/0014

摘要： A swept wavelength meter provides a real-time wavelength calibration scheme for a swept laser. The calibration scheme generates an electrical signal from a swept optical output of the swept laser that is cyclical with respect to the wavelength of the swept optical output over a defined range of wavelengths. The point on the electrical signal at any given time provides an accurate phase for the swept optical output at that point. The electrical signal in turn is calibrated by generating calibration references from the swept optical output using known absorption lines within the defined range of interest. The wavelength of the swept laser is calibrated as a function of a reference wavelength from the known absorption lines and the phase at the given point. Simultaneously forward and reflective measurements may be taken, with the forward measurement being used as a normalizing measurement for determining insertion and return loss automatically for a device under test.

摘要翻译： 扫描波长计为扫描激光器提供实时波长校准方案。 校准方案从扫描激光器的扫描光学输出产生相对于扫描光输出的波长在规定的波长范围内周期性的电信号。 在任何给定时间，电信号上的点都为扫描光输出提供了准确的相位。 电信号依次通过使用已知吸收线在规定的感兴趣范围内从扫描光学输出产生校准参考来校准。 扫描激光器的波长根据已知吸收线和给定点的相位作为参考波长的函数进行校准。 可以同时进行正向和反射测量，其中正向测量被用作归一化测量，用于自动确定被测器件的插入和返回损耗。

公开(公告)号：EP1130445A3

公开(公告)日：2002-09-04

申请号：EP01301318.0

申请日：2001-02-15

申请人： Tektronix, Inc.

发明人： Anderson, Duwayne R.

IPC分类号： G02B26/02 ,  G01J3/18

CPC分类号： G01J3/1804 ,  G01J3/02 ,  G01J3/0218 ,  G01J3/0243 ,  G01J3/0294 ,  G01J2003/1828 ,  G01J2003/2866 ,  G02B6/3534 ,  G02B6/3568 ,  G02B6/3586

摘要： An optical system having a first order spectral range that is usable in an optical spectrum analyzer receives an broadband optical test signal and a optical calibration signal and couples the optical signals via two optically isolated paths to separate optical detectors. First and second pairs of optical fibers, with each pair having an input fiber and an output fiber, are positioned in a focal plane of a collimating optic that has an optical axis. The fiber pairs are symmetrically positioned on either side of the optical axis with the input fibers positioned on one side of the optical axis and the output fibers positioned on the opposite side of the optical axis. The input fibers receive the optical test signal and the optical calibration signal. The output optical fibers are coupled to first and second optical detectors. An optical calibration source generates second order or greater spectral lines that fall within the first order spectral range of the optical system. A diffraction grating receives the optical test signal and the optical calibration signal from the collimating optic and separates the first order spectral components of the broadband optical test signal and passes the second order or greater spectral lines of the optical calibration signal. The first optical detector that is responsive to the first order spectral components of the optical test signal receives the optical test signal from the collimating optic and converts the optical test signal to an electrical signal. A second optical detector that is responsive to the second order or greater spectral lines of the optical calibration signal concurrently receives the optical calibration signal from the collimating optic and converts the calibrations signal to an electrical signal.

公开(公告)号：EP0856943B1

公开(公告)日：2002-12-04

申请号：EP98300732.9

申请日：1998-02-02

申请人： TEKTRONIX, INC.

发明人： Anderson, Duwayne R.

IPC分类号： H03G3/30 ,  H03G1/00

CPC分类号： H03G1/0047 ,  H03G3/24

公开(公告)号：EP1130445A2

公开(公告)日：2001-09-05

申请号：EP01301318.0

申请日：2001-02-15

申请人： Tektronix, Inc.

发明人： Anderson, Duwayne R.

IPC分类号： G02B26/02

CPC分类号： G01J3/1804 ,  G01J3/02 ,  G01J3/0218 ,  G01J3/0243 ,  G01J3/0294 ,  G01J2003/1828 ,  G01J2003/2866 ,  G02B6/3534 ,  G02B6/3568 ,  G02B6/3586

摘要： An optical system having a first order spectral range that is usable in an optical spectrum analyzer receives an broadband optical test signal and a optical calibration signal and couples the optical signals via two optically isolated paths to separate optical detectors. First and second pairs of optical fibers, with each pair having an input fiber and an output fiber, are positioned in a focal plane of a collimating optic that has an optical axis. The fiber pairs are symmetrically positioned on either side of the optical axis with the input fibers positioned on one side of the optical axis and the output fibers positioned on the opposite side of the optical axis. The input fibers receive the optical test signal and the optical calibration signal. The output optical fibers are coupled to first and second optical detectors. An optical calibration source generates second order or greater spectral lines that fall within the first order spectral range of the optical system. A diffraction grating receives the optical test signal and the optical calibration signal from the collimating optic and separates the first order spectral components of the broadband optical test signal and passes the second order or greater spectral lines of the optical calibration signal. The first optical detector that is responsive to the first order spectral components of the optical test signal receives the optical test signal from the collimating optic and converts the optical test signal to an electrical signal. A second optical detector that is responsive to the second order or greater spectral lines of the optical calibration signal concurrently receives the optical calibration signal from the collimating optic and converts the calibrations signal to an electrical signal.

摘要翻译： 具有第一级光谱范围所做的是在光谱分析仪一起使用的光学系统接收宽带光测试信号和光校准信号和夫妻经由两个光隔离路径的光信号分离的光学检测器。 第一和第二对光纤的，与具有输入纤维与纤维的输出的每一对，在准直光学器件的焦平面定位的确具有光轴。 光纤对对称地定位于与位于光轴的一侧上的输入光纤和位于光轴相反侧的输出光纤的光轴的两侧。 输入光纤接收光测试信号和光校准信号。 输出光纤被耦合到第一和第二光学检测器。 光校准源基因率第二级或以上的谱线落入光学系统的第一级光谱范围内没有。衍射光栅接收光测试信号和来自准直光学器件的光校准信号和分离的第一阶的频谱分量 宽带光测试信号和通过第二级或光校准信号的以上的谱线。 第一光学检测器所做的是响应于所述光测试信号的第一级光谱分量接收来自准直光学器件的光测试信号和光测试信号在电信号转换为。 第二光学检测器所做的是响应于所述第二顺序或光校准信号的以上的谱线同时接收从准直光学器件的光校准信号和转换该校准在电信号用信号通知。