| US 7,567,593 B2 | ||
| System and method for fractional Raman order pumping in optical communication systems | ||
| Herve A. Fevrier, Plano, Tex. (US); Andrej B. Puc, Allen, Tex. (US); Do Il Chang, Allen, Tex. (US); and Andrzej S. Kaminski, Allen, Tex. (US) | ||
| Assigned to XTERA Communications, Inc., Allen, Tex. (US) | ||
| Filed on Jun. 30, 2005, as Appl. No. 11/173,629. | ||
| Prior Publication US 2007/0002904 A1, Jan. 04, 2007 | ||
| Int. Cl. H01S 3/30 (2006.01) | ||
| U.S. Cl. 372—3 [372/6; 372/69; 372/70] | 20 Claims |
| 1. An optical communication system comprising:
a gain medium capable of receiving at least one optical signal comprising one or more optical signal wavelengths;
one or more pump sources capable of generating at least a first pump signal and a second pump signal for introduction to the
gain medium, the first pump signal comprising at least one integer Raman order band of pump wavelengths and the second pump
signal comprising at least one fractional Raman order band of pump wavelengths, the at least one integer Raman order band
of pump wavelengths comprising a plurality of integer Raman order pump wavelengths, each of the plurality of integer Raman
order of pump wavelengths comprising a Raman gain peak that is one stokes shift from at least one of the one or more optical
signal wavelengths, the at least one fractional Raman order band of pump wavelengths comprising a plurality of fractional
Raman order pump wavelengths, each of the plurality of fractional Raman order pump wavelengths comprising a Raman gain peak
that is a non-integer multiple of one stokes shift from each of the one or more optical signal wavelengths, wherein the non-integer
multiple of one stokes shift from each of the one or more optical signal wavelengths is greater than 1.1 stokes shifts and
less than 1.9 stokes shifts from each of the one or more optical signal wavelengths; and
wherein the at least one pump signal interacts with the optical signal as the pump signal traverses at least a portion of
the gain medium.
|