Charles B Henry

55966616, Jan 21, 1997

Dec 28, 1994

8/365618

Charles H. Henry - Skillman NJ
Edward J. Laskowski - Scotch Plains NJ
Yuan P. Li - Alpharetta GA
Cecilia Y. Mak - Bedminster NJ
Henry H. Yaffe - Dunwoody GA

Lucent Technologies Inc. - Murray Hill NJ

C02B 628

385 24

In accordance with the invention, a new type of monolithic optical waveguide filter comprises a chain of optical couplers of different effective lengths linked by differential delays of different lengths. The transfer of the chain of couplers and delays is the sum of contributions from all possible optical paths, each contribution forming a term in a Fourier series whose sum forms the optical output. A desired frequency response is obtained by optimizing the lengths of the couplers and the delay paths so that the Fourier series best approximates the desired response. The filter is advantageously optimized so that it is insensitive to uncontrolled fabrication errors and is short in length. The wavelength dependence of practical waveguide properties is advantageously incorporated in the optimization. Consequently, the filter is highly manufacturable by mass production.

49146670, Apr 3, 1990

May 30, 1989

7/358468

Greg E. Blonder - Maplewood NJ
Charles H. Henry - Skillman NJ
Rudolf F. Kazarinov - Martinsville NJ
Nils A. Olsson - Summit NJ
Kenneth J. Orlowsky - Middlesex NJ

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

H01S 319

372 44

In the interest of ease of manufacture, hybrid lasers of distributed-Bragg-reflector type are preferred for use as light sources in optical communications. Such lasers are made to operate away from mode instabilities by adjusting a laser parameter such as, e. g. , laser temperature, thereby assuring highly error-free transmission. Alternatively, by suitable design of the Bragg reflector it is possible to render mode instability of negligible influence on error rate.

52127583, May 18, 1993

Apr 10, 1992

7/866614

Renen Adar - Westfield NJ
Corrado Dragone - Little Silver NJ
Charles H. Henry - Skillman NJ

AT&T Bell Laboratories - Murray Hill NJ

G02B 610
H04J 1400

385129

An integrated optic device useful as a planar lens or a low order array multiplexer comprises a pair of optical couplers and an array of plural waveguides extending between the couplers in an "S" configuration to provide closely spaced optical path lengths. An "S" configuration provides equal path lengths for an optical lens. Incremental lengths added to the "S" in the region between curve reversal can provide small path length increments for a low order array multiplexer or demultiplexer.

57199760, Feb 17, 1998

Oct 24, 1995

8/547767

Charles Howard Henry - Skillman NJ
Edward John Laskowski - Scotch Plains NJ
Yuan P. Li - Duluth GA
Henry Howard Yaffe - Dunwoody GA

Lucent Technologies, Inc. - Murray Hill NJ

G02B 626

385 50

An optimized waveguide structure enables the functional integration of various passive optic components on a single substrate. The optimized waveguide structure is characterized by a thicker core layer than used for square core waveguides and a core width that changes according to different functional regions of the optic circuit within which it is incorporated. The height (H) of the waveguide core is determined by the thickness of the core layer defined during the fabrication process and is ideally uniform across the circuit. The width (W) of the core, however, is changed between functional regions by the photo-lithographic mask and the chemical etching during the fabrication process. By way of example, an optimized waveguide structure for a P-doped silica planar waveguide with a. DELTA. approximately 0.

39822079, Sep 21, 1976

Mar 7, 1975

5/556305

Raymond Dingle - Summit NJ
Charles Howard Henry - New Providence NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H01S 300

331 945H

Described is a heterostructure semiconductor laser comprising a pair of wide bandgap layers having an active region sandwiched therebetween characterized in that the active region includes a plurality of thin narrow bandgap active layers interleaved with a plurality of thin relatively wider bandgap passive layers. The passive layers are thin enough (e. g. , about 10-500 Angstroms) to permit electrons to distribute among the active layers either by tunneling through, or by hopping over, the energy barriers created by the passive layers. The active layers are thin enough (e. g. , about 10-500 Angstroms) to separate the quantum levels of electrons confined therein. These lasers exhibit wavelength tunability by changing the thickness of the active layers. Also described is the possibility of threshold reductions resulting from modification of the density of electron states.

45369402, Aug 27, 1985

Jun 4, 1984

6/617265

Charles H. Henry - New Providence NJ
Ralph A. Logan - Morristown NJ

AT&T Bell Laboratories - Murray Hill NJ

H01L 21263
H01L 3300
H01S 319

29569L

A buried heterostructure laser which obtains lowest mode operation by larger differences in loss between the lowest and higher order modes is described. The loss is achieved by interface scattering between the mesa and the burying layer. The scattering losses increases with refractive index discontinuity, interface roughness and decreasing mesa width. Stabilization results because scattering losses increase rapidly with the order of the transverse modes.

52767469, Jan 4, 1994

Jun 24, 1992

7/903690

Renen Adar - Westfield NJ
Charles H. Henry - Skillman NJ
Rudolf F. Kazarinov - Martinsville NJ
Michele A. Milbrodt - Macungie PA

AT&T Bell Laboratories - Murray Hill NJ

G02B 626

385 27

In accordance with the invention an integrated optic device useful as a low level polarization independent optical tap comprises a pair of optical waveguides intersecting at an angle of 10. degree. -25. degree. to provide a tap signal in the range minus 20 dB to minus 60 dB. In a preferred embodiment for use in a passive repeater for undersea cable, the device comprises fiber-matching waveguides of phosphorus silicate glass on an oxide covered silicon substrate with a boron and phosphorus silicate cladding. The waveguides preferably intersect at an angle of 13. degree. -16. degree. The preferred repeater further comprises a 3 dB coupler for averaging the power provided by two external pumping sources and a pair of wavelength division multiplexers for applying the pumping power to the outputs of the tap.

49520172, Aug 28, 1990

Mar 14, 1989

7/323462

Charles H. Henry - Skillman NJ
Rudolf F. Kazarinov - Martinsville NJ
Nils A. Olsson - Gillette NJ

AT&T Bell Laboratories - Murray Hill NJ

G02B 626
H03F 304
H01S 3098
H01L 2966

350 9615

In a fiber-optic communication system, a polarization independent semiconductor optical amplifier structure is achieved by tailoring the height-width aspect ratio of its active region to a value at least close to unity and at the same time using a laser cavity structure in which the end mirrors are buried in the semiconductor body in which the optical amplifier structure is built.