Jose A Roman

Address:

2509 E Monument St, Baltimore, MD 21205

VIN:

WMWMF73597TL92028

Make:

MINI

Model:

COOPER

Year:

2007

US Patent:

6496297, Dec 17, 2002

Filed:

Dec 22, 2000

Appl. No.:

09/746833

Inventors:

Michael Y. Frankel - Baltimore MD
Jose E. Roman - Annapolis MD

Assignee:

Ciena Corporation - Linthicum MD

International Classification:

G02F 101

US Classification:

359279, 359276, 359316, 359130

Abstract:

An optical device for modulating optical signals in a wavelength division multiplexed communication system. The device includes a plurality of phase modulators. Each of the phase modulators is configured to provide an associated phase modulated optical signal. Each of a plurality of optical filters receives an associated one of the optical signals and is configured to amplitude modulate the optical signal as an optical filter output signal. The optical filter output signals may be combined onto an aggregate path to a receiver including receiver optical filters for selecting the transmitted channels.

US Patent:

20090226186, Sep 10, 2009

Filed:

Mar 5, 2008

Appl. No.:

12/042748

Inventors:

Jose E. ROMAN - Catonsville MD, US
William J. Ulrich - Baltimore MD, US
Shan Zhong - Ellicott City MD, US

International Classification:

H04B 10/06

US Classification:

398202

Abstract:

The present invention provides a method for biasing/controlling an optical demodulator suitable for use in an optical phase-shift-keying (PSK) system, such as an optical differential-phase-shift-keying (DPSK) system or an optical differential-quadrature-phase-shift-keying (DQPSK) system, the method including: receiving a signal from an optical demodulator/balanced receiver pair; full-wave rectifying the signal; passing the full-wave rectified signal through a low-pass filter; monitoring the full-wave rectified signal received from the optical demodulator/balanced receiver pair and passed through the low-pass filter; and providing related feedback to the optical demodulator. Preferably, the signal includes a radio frequency (RF) signal. Full-wave rectifying the signal includes full-wave rectifying the signal using a full-wave rectifying circuit. Optionally, the low-pass filter includes about a 1 GHz bandwidth (BW) low-pass filter. Monitoring the full-wave rectified signal received from the optical demodulator/balanced receiver pair and passed through the low-pass filter includes monitoring the full-wave rectified signal using an RF power meter. The RF signal power monitored is dependent on an optical phase shift of the optical demodulator. Optionally, the method is employed in a high data rate optical transmission system.