Michael J Mills

US Patent:

6751012, Jun 15, 2004

Filed:

Dec 13, 2001

Appl. No.:

10/022140

Inventors:

Morten Nissov - Ocean Township NJ
Yanjie Chai - Marlboro NJ
Gregory M. Wolter - Oakhurst NJ
Michael A. Mills - Freehold NJ
George T. Harvey - Princeton NJ

Assignee:

Tyco Telecommunications (US) Inc. - Morristown NJ

International Classification:

H01S 300

US Classification:

359337, 359177, 356306

Abstract:

An apparatus for measuring the noise figure in optical amplifiers employed for large bandwidth applications such as dense wavelength division multiplexing systems. A booster amplifier coupled to a light source increases the average power associated with a plurality of optical channels. A periodic filter is coupled to the booster amplifier to reflect noise between each of the optical channels across the predetermined bandwidth. An amplifier under test is coupled to the periodic filter and the noise figure associated with the amplifier under test is measured.

US Patent:

7085039, Aug 1, 2006

Filed:

Mar 14, 2003

Appl. No.:

10/389373

Inventors:

Dmitri Foursa - Freehold NJ, US
Morten Nissov - Ocean NJ, US
Alexei N. Pilipetskii - Colts Neck NJ, US
Michael A. Mills - Freehold NJ, US
Chinlon Lin - Holmdel NJ, US
Bo Pedersen - Annapolis MD, US

Assignee:

Tyco Telecommunications (US) Inc. - Morristown NJ

International Classification:

H04B 10/12

US Classification:

359334, 3593374, 3593375

Abstract:

A hybrid Raman-EDFA provides gain equalization over the C-band and L-band. The hybrid Raman-EDFA includes a Raman section producing a Raman gain and an EDFA section producing an EDFA gain complementing the Raman gain. The EDFA section preferably includes a highly inverted, single-stage EDFA to produce the complementing EDFA gain shape. One embodiment of the EDFA section includes a high return loss termination located after the erbium fiber to receive unabsorbed pump power. Multiple hybrid Raman-EDFAs can be connected in an amplifier chain in a transmission system. The transmission system preferably provides a dispersion map including regular composite fiber spans followed by at least one compensating span of negative dispersion fibers. The Raman sections of the hybrid Raman-EDFAs are preferably coupled to negative dispersion fiber in the transmission system.