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    • 5. 发明授权
    • Optical device having modified transmission characteristics by localized thermal treatment
    • 通过局部热处理具有改进的传输特性的光学装置
    • US06442311B1
    • 2002-08-27
    • US09350205
    • 1999-07-09
    • Giovanni BarbarossaChellappan Narayanan
    • Giovanni BarbarossaChellappan Narayanan
    • G02B634
    • G02B6/13G02B6/105G02B2006/12171
    • Transmission characteristics of an optical device 200, fabricated from multiple layers 16, 27, 28 of silica-based glass on a silicon substrate 26, are modified by localized thermal treatment. The beam 501 of a carbon-dioxide (CO2) laser 510 is used to selectively soften the core and/or cladding material of a waveguide structure during or after the fabrication process. In one application, softening relieves the strain developed between the waveguide structure and the silicon substrate and substantially reduces or eliminates birefringence. In a second application, the CO2 laser is operated at another power level in order to modify the index of refraction. Changes in the index of refraction change the speed of light through a waveguide thereby changing the phase shift associated with the waveguide. In a third application, the CO2 laser is operated at yet another power level to increase the transmission loss of the waveguide. In all of the embodiments, heat treatment is substantially faster and/or less expensive than known techniques for modifying the transmission characteristics of an optical device.
    • 通过局部热处理改变在硅衬底26上由二氧化硅基玻璃的多层16,27,28制成的光学器件200的透射特性。 二氧化碳(CO2)激光器510的光束501用于在制造过程中或之后选择性地软化波导结构的芯和/或包层材料。 在一个应用中,软化消除了在波导结构和硅衬底之间产生的应变,并且基本上减少或消除了双折射。 在第二个应用中,CO2激光器在另一个功率电平下工作,以便改变折射率。 折射率的变化通过波导改变光的速度,从而改变与波导相关的相移。 在第三个应用中,CO2激光器在另一功率电平下操作以增加波导的传输损耗。 在所有实施例中,热处理比用于修改光学器件的传输特性的已知技术快得多和/或更便宜。
    • 7. 发明授权
    • Optical planar waveguide notch filters
    • 光学平面波导陷波滤波器
    • US5796906A
    • 1998-08-18
    • US704341
    • 1996-08-27
    • Chellappan NarayananHerman Melvin Presby
    • Chellappan NarayananHerman Melvin Presby
    • G02B6/00G02B6/12G02B6/124G02B6/10
    • G02B6/124G02B6/12007G02B2006/12107G02B2006/12109
    • An optical planar waveguide notch filter employs a waveguide with first, second and third regions. The first and third regions have structures for propagating an optical signal in a first transmission mode. The second region is located between the first and third regions and has a structure in which an optical signal propagates in the first transmission mode as well as at least one other higher order transmission mode. The structure of the second region further couples a particular wavelength band of the signal propagating in the first transmission mode to at least one of the other transmission modes. This coupling causes an attenuation of energy of such bandwidth in the signal propagating in the first transmission mode. As a result, the signal propagating from the second region to the third region in the first transmission mode is a notch filtered signal possessing an attenuation at the particular wavelength band.
    • 光学平面波导陷波滤波器采用具有第一,第二和第三区域的波导。 第一和第三区域具有用于在第一传输模式下传播光信号的结构。 第二区域位于第一和第三区域之间,并且具有其中光信号以第一传输模式以及至少一个其它更高阶传输模式传播的结构。 第二区域的结构还将在第一传输模式中传播的信号的特定波长带耦合到其它传输模式中的至少一个。 该耦合导致在第一传输模式中传播的信号中这种带宽的能量衰减。 结果,在第一传输模式中从第二区域传播到第三区域的信号是在特定波段具有衰减的陷波滤波信号。
    • 10. 发明授权
    • Fiber array test method and apparatus
    • 光纤阵列测试方法和设备
    • US5980120A
    • 1999-11-09
    • US936416
    • 1997-09-25
    • Chellappan Narayanan
    • Chellappan Narayanan
    • G01M11/00G02B6/36G02B6/38
    • G01M11/333G02B6/3807G02B6/3839G02B6/3636G02B6/3652
    • Disclosed is an apparatus for testing an array of optical fibers. According to the invention, modulated light is projected through individual fibers of a fiber array onto a photo-sensitive position sensor. The photo-sensitive sensor will provide position information relative to the position of the light projected upon its surface to a system computer. The positions of the optical fibers within the array relative to each other may thus be found. A loop is introduced into the optical fibers to lower the wavelength at which the fiber is multi-moded. The actual positions of the optical fibers are compared to desired positions and the fiber array is accepted or rejected based on whether it meets predetermined limits.
    • 公开了一种用于测试光纤阵列的装置。 根据本发明,调制光通过光纤阵列的各个纤维投影到感光位置传感器上。 光敏传感器将提供相对于在其表面上投射到系统计算机的光的位置的位置信息。 因此可以发现阵列内的光纤相对于彼此的位置。 将光纤引入到光纤中以降低光纤多模的波长。 将光纤的实际位置与期望的位置进行比较,并且基于其是否满足预定限度来接受或拒绝光纤阵列。