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Low Loss Waveguide Polyimide

IP.com Disclosure Number: IPCOM000122091D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Feger, C: AUTHOR [+2]

Abstract

For integrated optoelectronic (IOE) packages which use high temperature processing polymeric waveguides with low optical losses, high glass transition temperature and thermal stability of the optical characteristics (opto-thermal stability) at high temperatures (400oC) are needed. Polyimides are among the best high temperature stable organic material. However, usually they exhibit high optical losses or, if the optical losses are low, the thermal stability is lowered considerably. An exception is a polyimide based on hexafluoro isopropyliden-diphthalic acid dianhydride (6FDA) and 2,2'-bis(trifluoromethyl) biphenyl 4,4'-diamine (BTFB). This material exhibits low dielectric properties and low losses at 830 nm even after cure at 400oC. The losses are particularly low when the synthesis is conducted in q-butyrolactone (GBL).

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Low Loss Waveguide Polyimide

      For integrated optoelectronic (IOE) packages which use high
temperature processing polymeric waveguides with low optical losses,
high glass transition temperature and thermal stability of the
optical characteristics (opto-thermal stability) at high temperatures
(400oC) are needed. Polyimides are among the best high temperature
stable organic material.  However, usually they exhibit high optical
losses or, if the optical losses are low, the thermal stability is
lowered considerably.  An exception is a polyimide based on
hexafluoro isopropyliden-diphthalic acid dianhydride (6FDA) and
2,2'-bis(trifluoromethyl) biphenyl 4,4'-diamine (BTFB).  This
material exhibits low dielectric properties and low losses at 830 nm
even after cure at 400oC.  The losses are particularly low when the
synthesis is conducted in q-butyrolactone (GBL).  The glass
transition is 359oC and, thus, well suited for applications in
packages where high temperature processing is necessary.

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