Browse Prior Art Database

INTEGRATED PRISM INPUT COUPLER

IP.com Disclosure Number: IPCOM000024011D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 249K

Publishing Venue

Xerox Disclosure Journal

Abstract

Coupler 10 has utility as an electro-optic modulator and waveguide. The layered structure shown is similar to the leaky wave diode laser of U.S. Patent 4,063,189. Layer 1 is composed of a GaAs substrate, confining layer 2 is a thin layer of Ga1 xAl As, layer 3 is a waveguiding layer and composed of GaAs or Ga1 Al As(x>y-and -onfining layer 4 is composed of Ga1 Al As (z-y). Specific var-esf-rlayers 2, 3 and 4 are disclosed in the figure. O-ter compositions of Ga, Al, In, As, P, Sb,

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XEROX DISCLOSURE JOURNAL

INTEGRATED PRISM INPUT COUPLER Robert D. Burnham
Donald R. Scifres
William Streifer
Wolfgang Stutius

Ga 7A~3As (.2,~)

Proposed Classification
U.S. CL 350/96 \VG

mt. CL G02b 5/14

Coupler 10 has utility as an electro-optic modulator and waveguide. The layered structure shown is similar to the leaky wave diode laser of U.S. Patent 4,063,189. Layer 1 is composed of a GaAs substrate, confining layer 2 is a thin layer of Ga

1xAl As, layer 3 is a waveguiding layer and composed of GaAs or Ga

                           1 Al As (z~y). Specific var~esf~rlayers 2, 3 and 4 are disclosed in the figure. O~ter compositions of Ga, Al, In, As, P, Sb, Cd, Te, Zn, 5, etc., may also be used for the coupler as long as a similar refractive index profile is obtained.

Coherent light from a gas or solid state laser may be coupled into waveguiding layer 3 by directing the beam to impinge at an angle 8. onto a polished external surface 5 or onto a cleaved surface with an angle 8.. ~rhe beam may strike the surface at normal incidence or at an angle.

If surface 5 is normal to the layers of the coupler, the external angle at which the beam is launched into the coupler will have to be taken into consideration. This depends upon the refraction of index of the substrate-air interface at surface 5 in accordance with Snell's law.

To prevent the tendency of the optical wave 6 from coupling out of substrate 1 at the opposite end of the coupler 10 from the launched laser beam (at 7), layer 2 (or for that ma...