Browse Prior Art Database

A Single Mode Fiber Detector Receptacle With Mode Filter

IP.com Disclosure Number: IPCOM000119441D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Block, TR: AUTHOR [+4]

Abstract

Described is a method which incorporates a short length of 5/125um single mode optical fiber (SMF) 5 (see the figure) at 0.8um into a SMF detector receptacle to serve as a mode filter. This allows 0.8um source and detector components to be used in conjunction with 1.3um SMF.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

A Single Mode Fiber Detector Receptacle With Mode Filter

      Described is a method which incorporates a short length of
5/125um single mode optical fiber (SMF) 5 (see the figure) at 0.8um
into a SMF detector receptacle to serve as a mode filter.  This
allows 0.8um source and detector components to be used in conjunction
with 1.3um SMF.

      A 9/125 traditional SMF 1 has a connector installed with a
connector ferrule 2 in a standard manner.  This is mated to a second
ferrule using an elastic sleeve 3; a commonly used technique to
achieve alignment in fiber optic connector systems.  The second
ferrule contains a ceramic or glass capillary 4 which incorporates a
short length of single mode fiber at 0.8um providing the mode
filtering function.  The mode filter provides a high degree of
attenuation for higher order modes that may be propagating in the
9/125 fiber 1.  The use of an index matching adhesive to bond a fiber
cladding into the precision capillary 4 helps eliminate unwanted
cladding modes.  This is especially important when using such a short
length of small core (5um) SMF as a mode filter section here
employed.  A detector 6 could be either a standard avalanche photo
diode or PIN type photodetector.

      Disclosed anonymously.