Nicholas D King

US Patent:

7289735, Oct 30, 2007

Filed:

Apr 4, 2005

Appl. No.:

11/098229

Inventors:

Maxim Bolshtyansky - East Windsor NJ, US
Nicholas King - Lawrenceville NJ, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

H04J 14/02
H01S 3/091

US Classification:

398 94, 398 65, 398 92, 372 75

Abstract:

A laser apparatus is disclosed combining polarized light beams from two optical emitters into a combined beam of light with controllable degree of polarization (DoP). The laser apparatus includes a polarization combiner for combining the polarized beams into the combined beam, an optical tap for separating out a portion of the combined beam, and a photodetector electrically coupled to a laser controller for providing a feedback signal. The controller distinctively modulates the polarized radiation of each of the emitters, detects modulation signals in the photodetector output and adjusts an output power ratio of the optical emitters for maintaining the DoP of the combined beam at a pre-determined level. The invention can be used for minimizing the DoP of pump radiation in Raman and EDFA pump laser modules combining multiple pump laser diodes.

US Patent:

7715092, May 11, 2010

Filed:

Sep 28, 2007

Appl. No.:

11/863905

Inventors:

Maxim Bolshtyansky - East Windsor NJ, US
Nicholas King - Lawrenceville NJ, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

H04B 10/17
H04B 10/12

US Classification:

359334, 35933711, 3593374

Abstract:

Raman tilt is induced by the propagation of optical signals in optical communication fibers during and after transient events. Certain characteristics of the light are monitored at each amplification node and Raman tilt correction is achieved by spectral tilt control optics. The light is monitored either as total power, and/or the power of light after passing through one or more optical filters. In the case of EDFA (Erbium Doped Fiber Amplifier) the correction is performed by adjusting stage gains and VOA loss distribution within the amplifier. The light detection is relatively fast, whereby the tilt is compensated by fast controlled VOA and pump power adjustment during a transient event.