Position:The choice of OLT illuminant
Current, have a variety of methods illuminant of tectonic much wavelengh. The first kind of method is to choose what a group of wavelengh are close to, of disperse, but harmonious DFB laser (DFB laser array) , use temperature tuning to generate the signal of be issued to lower levels of much wavelengh. DFB laser array outputs spectrum to be able to pass control temperature to unite tuning, realize wavelengh monitoring easily, but because DFB laser outputs wavelengh to follow wave guide,effective refractive index changes, spectrum of output of very difficult accurate control and wavelengh road by implement channel interval matchs.
The 2nd kind of method is to use much frequency laser (MFL) . MFL is one kind is based on compositive semiconductor amplifier and WGR (WaveguideGratingRouter) new-style WDM laser of the technology, include N smooth amplifier and a grating of array wave guide of 1 х N, the every input end of grating of array wave guide is compositive a smooth amplifier. Output in smooth amplifier and grating of array wave guide an optical antrum is formed between end, if the gain of amplifier overcomes the loss inside antrum, have laser output, output wavelengh to be decided by the filter wave character of grating of array wave guide. Through direct modulation of each amplifier slant buy electric current, with respect to the signal of be issued to lower levels that can generate much wavelengh. The wavelengh interval of MFL differs a decision by the wave guide length in grating of array wave guide, OK and accurate control, each wavelengh can pass control same a temperature is unified adjust, facilitating wavelengh monitoring, it is ideal OLT illuminant. Had developed 16 channel interval to be the product of the MFL of 400GHz for 200GHz and 20 channel interval at present, direct modulation rate is 622Mbit/s.
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