Jonathan A Bloch

US Patent:

6496305, Dec 17, 2002

Filed:

Jul 23, 2001

Appl. No.:

09/911926

Inventors:

Derek Spock - Boston MA
Murat Azizoglu - Concord MA
Jonathan C. Bloch - Boston MA
Farzana I. Khatri - Andover MA
Vijayanand Vusirikala - Westford MA
Eric Arthur Swanson - Acton MA

Assignee:

Sycamore Networks, Inc. - Chelmsford MA

International Classification:

H01S 300

US Classification:

359349, 3593412

Abstract:

An optical amplifier for a 4-fiber system having two inputs and outputs is provided that makes use of a single amplifier rather than two separate amplifiers. The optical amplifier node makes use of an interleaver before and after the single amplifier to demultiplex and multiplex even and odd channel signals traveling in opposite directions. The arrangement can also amplify wide channel spaced signals traveling through a plurality of optical fibers. The optical amplifier node can be combined with other like amplifier nodes to provide more complex amplifier solutions at reduced costs due to the need for only half of the typical number of amplifiers. The optical amplifier node can also be combined with, e. g. , variable optical attenuators, L/C/S filters, channel add/drop, co- and counter-propagating Raman amplification, and dispersion compensation modules to modify the optical signals as desired.

US Patent:

7471859, Dec 30, 2008

Filed:

Aug 15, 2007

Appl. No.:

11/893553

Inventors:

Daniel Levner - Toronto, CA
Martin F. Fay - Providence RI, US
Jonathan C. Bloch - Boston MA, US
Jeffrey Weiss - Lincoln RI, US

Assignee:

Brown University Research Foundation - Providence RI

International Classification:

G02B 6/34
H04J 14/02

US Classification:

385 37, 385 1, 385 2, 385 14, 385129, 385130, 385131, 398 81

Abstract:

An optical waveguide has a surface. An array of separately actuated bodies is disposed proximal to the exposed surface, and an actuator separately actuates at least some of the bodies to change a spectral characteristic of a wave propagating through the waveguide. Preferably, the bodies are metal striplines, an electro-optical material is disposed between the striplines and the exposed surface, and the actuator is a CMOS chip that imposes a voltage to some or all of the lines. The voltage changes the refractive index at the interface with the surface, changing an index of refraction profile of the waveguide and effectively imposing a grating. Alternatively, the bodies are micro-beams and the actuator, also controlled by a CMOS chip, separately moves each micro-beam into and out of proximity to the surface. The grating is programmable via the CMOS chip. The programmable gratings may be used to couple different waves in the same or different waveguides, and may act as Bragg gratings, binary supergratings, or multi-level supergratings.

US Patent:

7577963, Aug 18, 2009

Filed:

Dec 29, 2006

Appl. No.:

11/648165

Inventors:

William J. O'Farrell - Jamestown RI, US
Jonathan C. Bloch - Cambridge MA, US
Christopher A. Shoemaker - West Warwick RI, US
Peter Woo - Providence RI, US
Miriam Goldberg - Providence RI, US
Tibet Sprague - Providence RI, US

Assignee:

Public Display, Inc. - Providence RI

International Classification:

G06F 3/00
G06F 17/00
G06F 7/00
G06F 9/45

US Classification:

719318, 715236, 707102, 717143

Abstract:

An event translator system for receiving input information, parsing event data on the input information to produce a result event data set and generating an event list based on an analysis of the event the result data set, performing an event listing and displaying event list to a user interface module. The event translation system translating event data also include receiving user feedback on the event listing and using the user feedback to improve subsequent operations of at least one harvesting algorithm. Translating event data also includes at least two harvesting algorithms for performing the input information to generate a plurality of result event data sets and creating an event listing for display to a user interface module based on an analysis of the plurality of result event data sets.

US Patent:

7263258, Aug 28, 2007

Filed:

Sep 24, 2004

Appl. No.:

10/949797

Inventors:

Daniel Levner - Toronto, CA
Martin F. Fay - Providence RI, US
Jonathan C. Bloch - Boston MA, US
Jeffrey Weiss - Lincoln RI, US

Assignee:

Brown University Research Foundation - Providence RI

International Classification:

G02B 6/34
H04J 14/02

US Classification:

385 37, 385 1, 385 2, 385 14, 385129, 385130, 385131, 398 81

Abstract:

An optical waveguide has a surface. An array of separately actuated bodies is disposed proximal to the exposed surface, and an actuator separately actuates at least some of the bodies to change a spectral characteristic of a wave propagating through the waveguide. Preferably, the bodies are metal striplines, an electro-optical material is disposed between the striplines and the exposed surface, and the actuator is a CMOS chip that imposes a voltage to some or all of the lines. The voltage changes the refractive index at the interface with the surface, changing an index of refraction profile of the waveguide and effectively imposing a grating. Alternatively, the bodies are micro-beams and the actuator, also controlled by a CMOS chip, separately moves each micro-beam into and out of proximity to the surface. The grating is programmable via the CMOS chip. The programmable gratings may be used to couple different waves in the same or different waveguides, and may act as Bragg gratings, binary supergratings, or multi-level supergratings.

US Patent:

6388805, May 14, 2002

Filed:

Mar 28, 2001

Appl. No.:

09/820266

Inventors:

Derek Spock - Boston MA
Murat Azizoglu - Concord MA
Jonathan C. Bloch - Boston MA

Assignee:

Sycamore Networks, Inc. - Chelmsford MA

International Classification:

H01S 300

US Classification:

3593412, 3593375

Abstract:

An optical amplifier for a 4-fiber system having two inputs and outputs is provided that makes use of a single amplifier rather than two separate amplifiers. The optical amplifier node makes use of an interleaver before and after the single amplifier to demultiplex and multiplex even and odd channel signals traveling in opposite directions. The optical amplifier node can be combined with other like amplifier nodes to provide more complex amplifier solutions at reduced costs due to the need for only half of the typical number of amplifiers. The optical amplifier node can also be combined with, e. g. , variable optical attenuators, L/C filters, channel add/drop, and dispersion compensation modules to modify the optical signals as desired.