OPTICAL WAVEGUIDE TYPE DEVICE

• Main Authors: YAMASHITA MAKI, INOUE NAOHISA
• Format: Patent
• Language: English
• Published: 14.02.1987
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE:To connect both waveguides to each other and to suppress light loss small on the whole by forming the 1st optical waveguide where an optical function element is formed at a specific part of a substrate and forming the 2nd waveguide which has small waveguide loss at another part of the same substrate. CONSTITUTION:A buffer layer 2 is formed on the substrate 1 by sputtering and the 1st waveguide 3 where an inter-digital transducer 7 is formed is formed on the substrate 1 at its center part. Further, the 2nd waveguides 4 are formed of a material having small light waveguide loss on buffer layers 3 on both sides on the same substrate 1. Those waveguides 4 are provided with lenses 5 and 6 and both waveguides 4 are coupled mutually on their end surfaces through the waveguide 3. Then, light from a laser diode 8 is collimated by the lens 5 and a surface acoustic wave SAW is generated by the piezoelectric effect of the waveguide 3; and the light is propagated and converted by the lens 6 of the waveguide 4, and the light is made incident on a photodetector array 9.