OPTICAL FIBER AMPLIFIED ELED LIGHT SOURCE WITH RELATIVE INTENSITY NOISE REDUCTION SYSTEM

摘要

A power boosted source of broadband optical powercomprising a broadband light source, optical fiberamplifier and a relative intensity noise reduction system.The optical fiber amplifier amplifies the power level ofthe optical input signal to provide a power boosted sourceof broadband optical power out of an output port. Acoupler samples a portion of the broadband optical powerout of the output port as a sample portion signal. Adetector and transimpedance amplifier detect the opticalsignal and provide a buffered signal having aninstantaneous amplitude that faithfully characterizes theintensity of the sample portion signal. A bandpassamplifier amplifies the buffered signal and provides anoutput control signal to a light source responsive to acomposite bias and control current for providing an outputoptical signal. The output optical signal is coupled tothe input of the optical fiber amplifier to be the opticalinput signal to the optical fiber amplifier. The outputoptical signal from the ELED has a substantially constantoutput intensity level and smooth and bell shaped broadband spectrum with a center optical wavelength within thegain bandwidth of the optical fiber amplifier.