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    • 3. 发明授权
    • Optical signal processing devices
    • 光信号处理装置
    • US4142775A
    • 1979-03-06
    • US727047
    • 1976-09-27
    • Vellayan RamaswamyRobert D. Standley
    • Vellayan RamaswamyRobert D. Standley
    • G02F1/225G02F1/313G02B5/14
    • G02F1/225G02F1/3136G02F2201/307G02F2203/055
    • 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.
    • 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。