double clad optical fiber has

THE INVENTION REGARDS FIBER SINGLEMODE. FIBER IN ACCORDANCE WITH THE INVENTION ARE FIBER PROFILE W, A SILICA, WHICH ARE DESIGNED SO AS TO SUBMIT TO A BROAD BAND ON A RANGE OF wAVELENGTH RANGE, AND PARTICULARLY A MINIMAL COLOR RELEASE TWO DIFFERENT WAVE LENGTH FOR EXAMPLE IN THE VICINITY OF AND 1.3mm 1.55mm. THESE PROPERTIES OBTAINED BY CHOOSING APPROPRIATE RELATIONSHIP BETWEEN THE VARIOUS PARAMETERS OF FIBER. YOU CAN GET DIFFERENT CURVES AND COLOR RELEASE BY WAVEGUIDE 50, 51, 52 ACCORDING TO THE CHOICE OF SETTINGS. APPLICATION TO OPTICAL TELECOMMUNICATIONS.