ARTICLE HAVING FIBER RAMAN DEVICE

摘要

PROBLEM TO BE SOLVED: To realize an article having a fiber Raman device that is pumped by light from seven or more pump LEDs (for example from fourteen pump LEDs). SOLUTION: The Raman device 10 is equipped with a silica type optical fiber 12 comprising at least a first and a second wavelength selective elements 13, 141 arranged to provide one or more light cavities to Raman shift light in the optical fiber 12, a first coupler to couple pumped light having a first wavelengthλ1 from a first pump light source 11 with the optical fiber 12, a means to provide an outgoing light utilizing means with Raman shifted Raman device outgoing light having a wavelengthλ0 higher thanλ1 and a second coupler 21 to couple pumped light having a second wavelengthλ2 from a second pump light source 111 with the optical fiber 12. Thenλ2 is different fromλ1 andλ0>λ2 is satisfied, and at least one out of the wavelength selective elements is off resonance with respect to at least one out ofλ1 andλ2.