Daniel R Mohr

US Patent:

7406269, Jul 29, 2008

Filed:

Feb 27, 2007

Appl. No.:

11/711572

Inventors:

Donald A. Becker - Edison NJ, US
Daniel R. Mohr - Allentown NJ, US
Christoph T. Wree - Ewing NJ, US
Abhay M. Joshi - New Hope PA, US

Assignee:

Discovery Semiconductors, Inc. - Ewing NJ

International Classification:

H04B 10/00

US Classification:

398206, 398203, 398205, 398207, 398213

Abstract:

An optical coherent receiver in one embodiment has a heterodyne configuration, and in another embodiment has a homodyne configuration, in each configuration employs multiple feedback signaling and analog/digital processing to optimize response to a modulated optical input signal, the provision of both individual RF I and RF Q channel outputs.

US Patent:

8126338, Feb 28, 2012

Filed:

Oct 29, 2008

Appl. No.:

12/290250

Inventors:

Christoph T. Wree - Ewing NJ, US
Suhas P. Bhandare - Levittown PA, US
Donald A. Becker - Edison NJ, US
Daniel R. Mohr - Allentown NJ, US
Abhay M. Joshi - New Hope PA, US

Assignee:

Discovery Semiconductors, Inc. - Ewing NJ

International Classification:

H04B 10/06

US Classification:

398208, 398204

Abstract:

Repeaterless transmission of differential phase-shift keying (DPSK) at 10. 7 Gb/s over at least 304 km of standard single-mode fiber is obtained through use of a coherent optical receiver including electronic dispersion compensation. High receiver sensitivity and high tolerance to nonlinearities of DPSK, allow overcoming a total link loss of 58 dB with a 3 dB system margin, through use in the receiver of heterodyne detection to preserve phase distortions resulting from chromatic dispersion, to permit electronic dispersion compensation to be used.

US Patent:

44700202, Sep 4, 1984

Filed:

May 6, 1982

Appl. No.:

6/375659

Inventors:

Daniel R. Mohr - Cranbury NJ

International Classification:

H03F 134
G11B 502

US Classification:

330304

Abstract:

This application discloses a virtual ground pre-amplifier for application with magnetic phono cartridges such as moving coil, moving magnet, moving iron, or similar types. The preamplifier according to the present invention comprises a forward path (an amplifier), and a reverse path (shunt feedback). By presenting a relatively low load impedance to the phono cartridge, the preamplifier effectively damps mechanical resonances of the stylus-cartridge system, and thus serves as a "stylus stabilizer. " Also disclosed are techniques for equalizing the overall response of the stylus-cartridge-preamp system so as to provide a predetermined (e. g. , flat) frequency response. This predetermined frequency response can be achieved by utilizing any of several circuit arrangements which serve to compensate for the intrinsic inductance and dc resistance of the magnetic phono cartridge. A detailed description is given of a high-performance complementary-symmetry "operational-type" amplifier which is well-suited for use in the forward path of the preamplifier.