Method for adjusting coupling optics and the end of a waveguide relative to a semiconductor laser

US4746195A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Franz Auracher · Munich, DE
• Rudolf Keil · Munich, DE
• Julius Wittmann · Deisenhofen, DE
• Hans-Ludwig Althaus · Lappersdorf, DE
• Gerhard Kuhn · Altötting, DE

Key dates

• Filing date: Mar 13, 1985
• Grant date: May 24, 1988
• Expiry date: Mar 13, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S359/90
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for positioning a laser diode with respect to a coupling optic for a waveguide to obtain the optimum light transmission characterized by providing a reflecting reference plane or surface extending perpendicular to the axis of the waveguide adjacent the coupling optic, projecting light through the waveguide and coupling optic onto the reflecting surface, measuring the amount of light reflected into the waveguide and adjusting the axial position of the waveguide and optic relative to the reflecting surface to obtain the optimum value, then placing the semiconductor with the facet in the reference plane and either operating the semiconductor to provide light for coupling into the waveguide and adjusting the relative positions in a transverse plane to the axis of the waveguide to obtain the optimum transmission or operating the semiconductor laser as a detector and coupling light into the waveguide at a point spaced from the laser to project into the detector and making adjustments in the transverse direction to obtain the optimum reading. The reflecting surface can be either a separate reflecting device or the facet of the laser. The apparatus includes two membe…