公开(公告)号：US06965622B1

公开(公告)日：2005-11-15

申请号：US10353242

申请日：2003-01-28

申请人： Si Hyung Cho ,  Ilya Lyubomirsky ,  Doyle Nichols ,  Gerald McAdoo ,  Larry Davis

发明人： Si Hyung Cho ,  Ilya Lyubomirsky ,  Doyle Nichols ,  Gerald McAdoo ,  Larry Davis

IPC分类号： H01S3/00 ,  H01S5/06 ,  H01S5/0687 ,  H01S5/12 ,  H04B10/155

CPC分类号： H04B10/572 ,  H01S5/0612 ,  H01S5/0687 ,  H01S5/12

摘要： The present invention is directed toward a laser wavelength locking scheme suitable for incorporation into WDM systems having channel spacings of 25 GHz or less. In a preferred embodiment, light output from the laser is supplied to a filtering element, such as an in-fiber Bragg grating or an etalon, and photodetectors are used to sense light transmitted through and either reflected by the filtering element or input to the filtering element. A measured ratio corresponding to a quotient of the photocurrents generated by the photodetectors is calculated and compared to a desired ratio corresponding to a measured temperature of the filtering element when the filtering element transmits the desired wavelength to be locked. Based on the comparison of the desired and measured ratios, a temperature error value is calculated which is used to adjust the laser temperature, as well as the laser wavelength. Accordingly, the temperature of the filtering element, for example, influences the laser temperature, so that wavelength variations stemming from temperature induced changes in the filtering element and other components in the laser package can be compensated, and the output wavelength can remain substantially fixed.

摘要翻译： 本发明涉及一种适用于掺入具有25GHz或更小的信道间隔的WDM系统的激光波长锁定方案。 在优选实施例中，从激光器输出的光被提供给诸如光纤内布拉格光栅或标准具的滤波元件，并且光电探测器用于感测透过的光，并且由滤光元件反射的光或者滤波器的输入 元件。 计算对应于由光电探测器产生的光电流的商的测量比，并将其与当滤波元件透过要锁定的期望波长时对应于滤波元件的测量温度的期望比率进行比较。 根据所需和比率的比较，计算用于调节激光温度以及激光波长的温度误差值。 因此，过滤元件的温度例如影响激光温度，从而可以补偿源自激光器封装中的过滤元件和其它部件的温度引起的变化引起的波长变化，并且输出波长可以保持基本上固定。