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A Low Cost Dynamic Erasable Optical Switch

IP.com Disclosure Number: IPCOM000105398D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Liu, K: AUTHOR [+2]

Abstract

Disclosed here is a low cost dynamically erasble optical switch for application in wavelength division multiaccess networks. The proposed scheme involves optical pumping of Erbium 3 sup + doped glass planar waveguide such that the propagating signal from the i sup th input port can be connected through gain guiding to the j sup th output port.

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A Low Cost Dynamic Erasable Optical Switch

      Disclosed here is a low cost dynamically erasble optical switch
for application in wavelength division multiaccess networks.  The
proposed scheme involves optical pumping of Erbium 3 sup + doped
glass planar waveguide such that the propagating signal from the i
sup th input port can be connected through gain guiding to the j sup
th output port.

      Wavelength division multiaccess networks may require an optical
switch to cross connect the signal from any input port, say the i sup
th port, to any output port, say the j sup th output port [1,2].
Existing schemes based on (1) semiconductor switches suffers too high
optical attenuation, (2) Li Nb O sub 3 and optically active polymeric
switches suffer too restrictive optical bandwidth.  Here, we propose
a low cost dynamically erasable optical switch based on optical
pumping of Erbium 3 sup + doped glass planar waveguide.

      The basic scheme is shown in the Figure.  The switch structure
is identical to the star coupler structure proposed in[3] but with
the planar waveguide layer doped with Erbium 3 sup + ions to provide
gain when pumped.  Because of Fresnel diffraction, the signal from
any input port can reach all the output ports but suffers attenuation
and splitting loss.  A computer controlled scanning mirror is used to
project the pump laser power onto the waveguide layer, connecting the
path between any input port to any output port.  The signal will t...