Design Of Gain Flattening Filter With Isolator

Gain flattening filter (GFF) based on thin-film filter technology, is one forerbium-doped fiber amplifier (EDFA) spontaneous emission (ASE) spectral featuresdesigned to reverse filter for spontaneous dissipate EDFA gain is too high part of theradiation, so that the target wavelength range of the filtered output gain as flat aspossible, the output signal power of each channel as a balanced, thus contributing toreduce system error. GFF device has great market potential as to it effectively broadenthe EDFA gain.Based on passive device technology and designed, GFF with isolator meet theEDFA in the commercial on cost and performance requirements. The GFF withisolator focused on the design of the product structure and production process fromproduct–oriented, and designed a welded structure GFF with isolator according theGFF principle. By adjusting the angle of incident light to achieve the actual GFFcurve to meet the objective EDFA design curve requirements, so that the actual peakto peak error function (PPEF) minimize, meanwhile integrated the function of thedevice isolation. It comes to the collimator design structure and parameters as totheoretical calculation and analysis in order to obtain the change of the angle ofincident light. Meanwhile, in order to cope with this use of the collimator, using afiltering technique based on thin film filters as a core component.Under structure design and theory analysis of this new type GFF with isolator, itsupplies the method of sample building. Through the experimental data analysis andevaluation, we can come out the GFF with isolator product can achieve the company’sproduct development goals and meet commercialization.