Patent ID: 6181464
Filing Date: 2001-01-30
Classification: H01S

Abstract:
A method of providing pump energy to an optical fiber located along an optical transmission path, said optical fiber imparting Raman amplification to an optical signal traveling therein, said method comprising:generating a first beam of pump energy at a predetermined pump wavelength so as to impart Raman amplification at about the optical signal wavelength and generating a second beam of pump energy at a predetermined pump wavelength about one Raman Stokes order below said predetermined pump wavelength of said first beam of pump energy so as to impart Raman amplification at about said predetermined pump wavelength of said first beam of pump energy;introducing the first beam of pump energy to the optical fiber so that it contrapropagates with respect to the optical signal; andintroducing the second beam of pump energy to the optical fiber so that it contrapropagates with respect to the first beam of pump energy.