Wesley M Townsend

US Patent:

54397820, Aug 8, 1995

Filed:

Dec 13, 1993

Appl. No.:

8/165203

Inventors:

William H. Haemmerle - Florham Park NJ
William M. MacDonald - Lebanon NJ
Casimir R. Nijander - Lawrenceville NJ
Joseph Shmulovich - Murray Hill NJ
Wesley P. Townsend - Princeton NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G02B 612

US Classification:

430321

Abstract:

Tapered optical waveguides (33') can be easily made by using photolithographic masking and etching to define on a substrate (21) a first polymer structure (22) having a substantially uniform thickness and a tapered width. The first polymer structure is heated sufficiently to form a meniscus along its entire length. The fluidity causes the material to redistribute itself such that, rather than being of uniform thickness, it has a thickness that varies with its width; consequently, the thickness as well as the width of the first polymer structure becomes tapered. The first polymer is cooled and hardened to form a second polymer structure (22') that has a tapered width and a tapered thickness as is desirable for a tapered optical waveguide. The second polymer structure itself can be used as a tapered optical waveguide, or it can be used to control the reactive ion etching of the underlying substrate. In the latter case, the configuration of the tapered second polymer structure is replicated in a glass substrate, for example, which then may be used as a glass tapered optical waveguide (33').

US Patent:

54125065, May 2, 1995

Filed:

Mar 9, 1992

Appl. No.:

7/848456

Inventors:

Avi Y. Feldblum - Highland Park NJ
Jurgen Jahns - Shrewsbury NJ
Casimir R. Nijander - Lawrenceville NJ
Frank Sauer - Clarksburg NJ
Wesley P. Townsend - Princeton NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G02B 632
G02B 634
G02B 518
G02F 103

US Classification:

359569

Abstract:

A diffractive and a refractive microlens component are combined into a doublet lens to obtain imaging properties that are improvements over those achievable using separate components. In one application, diffractive/refractive microlens arrays are arranged to provide a free-space optical permutation interconnect arrangement.

US Patent:

52863387, Feb 15, 1994

Filed:

Mar 1, 1993

Appl. No.:

8/024035

Inventors:

Avi Y. Feldblum - Highland Park NJ
Keith O. Mersereau - Northampton PA
Casimir R. Nijander - Lawrenceville NJ
Wesley P. Townsend - Princeton NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

B44C 122
C03C 1500
C03C 2506

US Classification:

156643

Abstract:

During a reactive ion etching process (FIG. 5) for making lens elements (15, FIG. 4) in a silica substrate (12), the gas constituency in the reactive ion etch chamber is changed to adjust the curvature of lens elements formed in the silica substrate and to reduce the aberrations of such lens elements. For example, two gases, CHF. sub. 3 and oxygen may be supplied to the reactive ion etch chamber and, during the reactive ion etch process, the proportion of oxygen is significantly reduced, which reduces the aberrations of the lens elements formed by the process.

US Patent:

50248731, Jun 18, 1991

Filed:

Dec 5, 1988

Appl. No.:

7/280074

Inventors:

John J. Burack - Elizabeth NJ
Jane D. LeGrange - Princeton NJ
Wesley P. Townsend - Princeton NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

B32B 2700

US Classification:

428220

Abstract:

A Langmuir-Blodgett monolayer polyimide film and a bulk amorphous polyimide film are in contacting superposed relation to form a composite film having improved moisture resistance. The composite film may be either a free film or provide an insulating coating on the surface of a microelectronics device.