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Browse Prior Art Database

Fiber Stub Transmitter Optical Sub-Assembly with GRIN Lens

IP.com Disclosure Number: IPCOM000116472D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bogdan, DC: AUTHOR [+8]

Abstract

Transmitter Optical SubAssemblies (TOSAs) are the technology of choice to transmit signals in optical data links. Disclosed is a TOSA using a fiber stub 1 and GRaded INdex of refraction (GRIN) lens 2 as shown in the Figure. The disclosed TOSA is mechanically simple while minimizing Reflection-Induced Intensity Noise (RIIN) and random jitter, and increasing the coupling efficiency. The fiber stub 1 is a fiber optic connector ferrule that is used as an interposer between the light source and the receiving fiber ferrule. This fiber stub TOSA design is unique in that it combines a fiber stub assembly 3 with a laser source 4 and GRIN lens 2 in a separate assembly 5. The GRIN lens 2 assures coupling efficiencies of greater than 30% from the laser 4 into the fiber stub 1.

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Fiber Stub Transmitter Optical Sub-Assembly with GRIN Lens

      Transmitter Optical SubAssemblies (TOSAs) are the technology of
choice to transmit signals in optical data links.  Disclosed is a
TOSA using a fiber stub 1 and GRaded INdex of refraction (GRIN) lens
2 as shown in the Figure.  The disclosed TOSA is mechanically simple
while minimizing Reflection-Induced Intensity Noise (RIIN) and random
jitter, and increasing the coupling efficiency.  The fiber stub 1 is
a fiber optic connector ferrule that is used as an interposer between
the light source and the receiving fiber ferrule.  This fiber stub
TOSA design is unique in that it combines a fiber stub assembly 3
with a laser source 4 and GRIN lens 2 in a separate assembly 5.  The
GRIN lens 2 assures coupling efficiencies of greater than 30% from
the laser 4 into the fiber stub 1.  The side of the fiber stub 1 that
mates to the receiving fiber's ferrule is Physical Contact (PC)
polished to assure maximum coupling of light to the link.

      The side of the fiber stub 1 that receives the laser light is
angled to prevent specularly reflected light from coupling back into
the laser.  Hence, RIIN and random jitter are minimized in this
design.

      The disclosed design has also been shown to increase the
coupling efficiency of the TOSA.  Since laser safety concerns limit
the allowed uncoupled optical power level, a greater coupling
efficiency enables more optical power to be coupled to the link.