Christian J Rasmussen

Author:

Christian Rasmussen

ISBN #:

8787582546

Author:

Christian Heilskov Rasmussen

ISBN #:

8770281912

Author:

Christian Heilskov Rasmussen

ISBN #:

8770282455

Author:

Christian Heilskov Rasmussen

ISBN #:

8770282536

US Patent:

7949261, May 24, 2011

Filed:

Apr 25, 2007

Appl. No.:

11/740212

Inventors:

Benny Mikkelsen - Newton MA, US
Pavel Mamyshev - Morganville NJ, US
Christian Rasmussen - Shrewsbury MA, US
Fenghai Liu - Nashua NH, US

Assignee:

Mintera Corporation - Acton MA

International Classification:

H04B 10/06

US Classification:

398208, 398202, 398209, 398212, 398213, 398140, 398141, 398158

Abstract:

An optical receiver includes a demodulator having a delay interferometer comprising an optical input that receives a phase modulated optical signal from a bandwidth limited transmission system. The delay interferometer has a free spectral range that is larger than a symbol rate of the phase modulated optical signal by an amount that improves receiver performance. The receiver also includes a differential detector having a first and a second photodetector. The first photodetector is optically coupled to the constructive optical output of the delay interferometer. The second photodetector is optically coupled to the destructive optical output of the delay interferometer. The differential detector combines a first electrical detection signal generated by the first photodetector and a second electrical detection signal generated by the second photodetector to generate an electrical reception signal.

US Patent:

7366425, Apr 29, 2008

Filed:

Mar 11, 2003

Appl. No.:

10/386359

Inventors:

Pavel V. Mamyshev - Morganville NJ, US
Christian J. Rasmussen - Nashua NH, US
Benny P. Mikkelsen - Boston MA, US
Fenghai Liu - Nashua NH, US

Assignee:

Mintera Corporation - Lowell MA

International Classification:

H04B 10/04

US Classification:

398188

Abstract:

Different techniques for generating spectrally efficient carrier-suppressed modulated optical signals, also known as “phase-shaped binary transmission” (PSBT) signals, employ electrical components that generate only 2-level or binary signals, in contrast to techniques that require 3-level electrical drivers. The PSBT modulators can be used with return-to-zero (RZ) modulators for generating RZ-PSBT signals, which have the characteristic of even greater spectral efficiency than NRZ PSBT signals. The technique is generalized to RZ signals with an arbitrary phase difference between pulses. These signals can be generated by shifting the central (carrier) frequency of an RZ modulated optical signal, which can be done using a certain phase modulation or using spectral filtering with a passband offset from the center (carrier) frequency of the modulated optical signal, and the signals can also be generated by phase modulation at a frequency lower than the signaling rate of the modulated signal.

US Patent:

20030218790, Nov 27, 2003

Filed:

Mar 17, 2003

Appl. No.:

10/391534

Inventors:

Benny Mikkelsen - Boston MA, US
Christian Rasmussen - Nashua NH, US
Tina Fjelde - Boston MA, US
Fenghai Liu - Nashua NH, US
Pavel Mamyshev - Morganville NJ, US
David Wolfson - Boston MA, US
John Kaufmann - Maynard MA, US

Assignee:

MINTERA CORPORATION

International Classification:

G02F001/01
G02B026/00

US Classification:

359/238000

Abstract:

A high speed digital optical transmission system that improves data transmission performance in both linear and nonlinear system environments. The high speed optical transmission system includes a laser for generating a CW light beam, and a data modulator for modulating the CW light beam in response to an electrical NRZ data signal to generate a modulated NRZ optical signal with positive chirp. The bias point of the data modulator is obtained by increasing the bias offset relative to quadrature while maintaining the voltage corresponding to a 0 bit at a predetermined level. The bias point allows the data modulator to be operated so that the chirp of the modulated NRZ optical signal is positive for most of each bit time slot.

US Patent:

20110280588, Nov 17, 2011

Filed:

Apr 14, 2011

Appl. No.:

13/086804

Inventors:

Benny MIKKELSEN - Newton MA, US
Pavel MAMYSHEV - Morganville NJ, US
Christian RASMUSSEN - Shrewsbury MA, US
Fenghai LIU - Nashua NH, US

International Classification:

H04B 10/06

US Classification:

398202

Abstract:

An optical receiver includes a demodulator having a delay interferometer comprising an optical input that receives a phase modulated optical signal from a bandwidth limited transmission system. The delay interferometer has a free spectral range that is larger than a symbol rate of the phase modulated optical signal by an amount that improves receiver performance. The receiver also includes a differential detector having a first and a second photodetector. The first photodetector is optically coupled to the constructive optical output of the delay interferometer. The second photodetector is optically coupled to the destructive optical output of the delay interferometer. The differential detector combines a first electrical detection signal generated by the first photodetector and a second electrical detection signal generated by the second photodetector to generate an electrical reception signal.

US Patent:

20140105617, Apr 17, 2014

Filed:

Oct 17, 2013

Appl. No.:

14/056520

Inventors:

- Maynard MA, US
Christian RASMUSSEN - MAYNARD MA, US

International Classification:

H04B 10/61

US Classification:

398208

Abstract:

Disclosed herein are methods, structures, and devices that provide multi-range frequency domain compensation of chromatic dispersion within optical transmission systems that offer significant operational power savings. More specifically, a method of operating frequency domain filtering structures and circuits including FFT, frequency-domain filter multiplication and iFFT functions at a lower duty cycle for shorter overlap such that significant power savings is realized.