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1. 发明授权

US4439265A Fabrication method for LiNbO.sub.3 and LiTaO.sub.3 integrated optics devices 失效
标题翻译： LiNbO3和LiTaO3集成光学器件的制造方法
公开(公告)号：US4439265A
公开(公告)日：1984-03-27
申请号：US284472
申请日：1981-07-17
申请人： Rodney C. Alferness , Lawrence L. Buhl , Janet L. Jackel , Susan P. Lyman , Vellayan Ramaswamy
发明人： Rodney C. Alferness , Lawrence L. Buhl , Janet L. Jackel , Susan P. Lyman , Vellayan Ramaswamy
IPC分类号： C30B31/02 , C30B31/06
CPC分类号： C30B31/02 , C30B29/30
摘要： A simple, inexpensive, and reliable technique for substantially preventing the unwanted formation of a surface guiding layer during manufacture of light-guiding structures in LiNbO.sub.3 and LiTaO.sub.3 substrates is disclosed. The technique involves addition of an effective amount of a gaseous hydrogen donor to the processing atmosphere during high-temperature processing. A particularly convenient hydrogen donor is water vapor, which can be added to the atmosphere by, for instance, bubbling of the feed gas through a water column. A partial pressure of more than about 9 Torr of H.sub.2 O has been found effective in the practice of the technique.
摘要翻译：公开了一种用于在LiNbO 3和LiTaO 3衬底中制造导光结构期间基本上防止表面引导层不想要的形成的简单，便宜且可靠的技术。该技术涉及在高温处理期间向处理气氛中加入有效量的气态氢供体。特别方便的氢供体是水蒸气，其可以通过例如将进料气体鼓泡通过水柱而添加到大气中。已经发现超过约9托的H 2 O的分压在该技术的实践中是有效的。

2. 发明授权

US4179189A Single polarization optical fibers and methods of fabrication 失效
标题翻译：单极化光纤和制造方法
公开(公告)号：US4179189A
公开(公告)日：1979-12-18
申请号：US869366
申请日：1978-01-13
申请人： Ivan P. Kaminow , Vellayan Ramaswamy
发明人： Ivan P. Kaminow , Vellayan Ramaswamy
IPC分类号： C03B37/012 , C03B37/018 , G02B6/10 , G02B5/14
CPC分类号： G02B6/105 , C03B37/01205 , C03B37/01861 , C03B37/01892 , C03B2203/02 , C03B2203/04 , C03B2203/30
摘要： Orthogonally polarized waves are more effectively decoupled in a waveguide that is fabricated in a manner so as to deliberately enhance stress-induced birefringence. This characteristic is accomplished by introducing a geometrical and material asymmetry in the preform from which the optical fiber is drawn. Three methods of preparing the preform are disclosed. Optical waveguides capable of transmitting power with only one direction of polarization are desirable for use with integrated optical devices which are polarization sensitive.
摘要翻译：正交极化波更有效地在以以故意增强应力诱导双折射的方式制造的波导中去耦合。该特性是通过在预成型件中引入几何和材料不对称来实现的，其中拉伸光纤。公开了三种制备预型件的方法。仅在一个极化方向上发射功率的光波导对于与偏振敏感的集成光学器件一起使用是理想的。

3. 发明授权

US4142775A Optical signal processing devices 失效
标题翻译：光信号处理装置
公开(公告)号：US4142775A
公开(公告)日：1979-03-06
申请号：US727047
申请日：1976-09-27
申请人： Vellayan Ramaswamy , Robert D. Standley
发明人： Vellayan Ramaswamy , Robert D. Standley
IPC分类号： G02F1/225 , G02F1/313 , G02B5/14
CPC分类号： G02F1/225 , G02F1/3136 , G02F2201/307 , G02F2203/055
摘要： Optical signal processing devices, primarily intended for use in integrated optical communication systems, include 3 dB coupled strip guide directional couplers. Each coupler is formed in a body of electrooptic material and includes electrodes bracketing at least one of the guides in the coupled region. Each coupler is fabricated so as to be overcoupled (i.e., greater than 3 dB coupling) when the coupling is synchronous. Voltage bias, supplied to the electrodes of each coupler, produces sufficient asynchronism to independently adjust each coupler to the desired 3 dB coupling condition. Permutation switches are produced by including a switchable phase shifter between two couplers. Channel drop filters are produced by including reflection gratings between two couplers. Differential phase detectors, for a pulse code modulation system, are produced by including a selected path length difference between the two strip guides connecting two couplers. A photolithographic technique for producing the required electrodes in precise registry with the strip guide couplers (typically characterized by 3 micrometer spacings) includes the use of the primary strip guide mask and a secondary mask to produce a photolithographic mask for defining the electrodes.
摘要翻译：主要用于集成光通信系统的光信号处理设备包括3 dB耦合条导向定向耦合器。每个耦合器形成在电光材料体中，并且包括围绕耦合区域中的至少一个引导件的电极。当耦合是同步的时，每个耦合器被制造成过耦合（即，大于3dB耦合）。提供给每个耦合器的电极的电压偏压产生足够的异步，以将每个耦合器独立地调整到所需的3 dB耦合条件。通过在两个耦合器之间包括可切换移相器来产生置换开关。信道降滤波器是通过在两个耦合器之间包括反射光栅来产生的。用于脉冲编码调制系统的差分相位检测器通过在连接两个耦合器的两个条形引导件之间包括选定的路径长度差来产生。用于产生精确对准带状引导耦合器（通常以3微米间隔为特征）的所需电极的光刻技术包括使用主条引导掩模和次掩模以产生用于限定电极的光刻掩模。

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