Browse Prior Art Database

Precision-Registered Transmissive Optical Components for Long-Wave Length Optical Systems

IP.com Disclosure Number: IPCOM000101391D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Johnson, M: AUTHOR

Abstract

Preferentially etched silicon may be used not only to align and register optical components, but it also can be used simultaneously as a transmissive optical component in the system. Some examples are described.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 68% of the total text.

Precision-Registered Transmissive Optical Components for Long-Wave Length Optical Systems

       Preferentially etched silicon may be used not only to
align and register optical components, but it also can be used
simultaneously as a transmissive optical component in the system.
Some examples are described.

      The use of structures etched in single crystal silicon for the
precision alignment and registration of optical fibers is well known.
The silicon is used there purely for mechanical support, with no
regard for its optical properties.  The reason for this is clear.  At
the most utilized optical communication wavelength of  0.85 micron,
silicon is an opaque, hard solid with well-known selective etching
properties.  At wavelengths longer than  1.1 micron, however, and in
particular at the increasingly useful wavelength of  1.3 micron,
silicon is transparent, with a high refractive index.

      The general idea is to use the silicon both as a hard aligner
of optical elements (for example, fibers) and as a transparent
optical element (either active or passive) itself, in the same hybrid
structure.

      Two simple examples of this idea are illustrated.  A SELFOC*
lens coupler is shown in Fig. 1.  A thick silicon wafer 10 is etched
on one side with a shallow socket 12 to accept and accurately align a
SELFOC lens rod 14.  The other side is etched in the usual way to
obtain a V-groove 16 for alignment of fiber 18.  The fiber is
polished at one...