초록 ▼

An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a h

An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a halide-doped silicate glass that comprises approximately the following in cation-plus-halide mole percent 0.25-5 mol % Al2O3,0.05-1.5 mol % La2O3,0.0005-0.75 mol % Er2O3,0.5-6 mol % F, 0-1 mol % Cl.

대표청구항 ▼

An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a h

An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a halide-doped silicate glass that comprises approximately the following in cation-plus-halide mole percent 0.25-5 mol % Al2O3,0.05-1.5 mol % La2O3,0.0005-0.75 mol % Er2O3,0.5-6 mol % F, 0-1 mol % Cl. the first delta sigma sampler comprises: one or more low pass filters each of which consists of continuous time circuitry. 3. The receiver according to claim 1 wherein the first decimator is characterized by: a Sinc function raised to an integer power frequency response. 4. The receiver according to claim 1 wherein the first digital mixer comprises: a canonic signed digit multiplier circuit. 5. The receiver according to claim 1 wherein the second decimator comprises: one or more canonic signed digit multipliers. 6. The receiver according to claim 1 wherein the second decimator comprises: a filter characterized by a impulse response shape that approximates a shape of a base band signal that is embedded in the first series of samples. 7. The receiver according to claim 6, wherein: the second rate is between about 10 and 30 times a Nyquist rate of the base band signal. 8. The receiver according to claim 1 wherein: the intermediate to base band converter further comprises: a second digital mixer coupled to the first decimator for receiving the second series of samples and multiplying successive subsets of the second series of samples by a second set of function values and outputting a second series of products, a second delta sigma sampler for receiving a second intermediate frequency signal component characterized by the intermediate frequency, and in response thereto outputting a fifth series of samples, wherein the second delta sigma sampler is characterized by the low pass transfer function; a third decimator coupled to the second delta sigma sampler for receiving the fifth series of samples at the first rate and outputting a sixth series of samples at the second rate; a third digital mixer coupled to the third decimator for receiving the sixth series of samples and multiplying successive subsets of the sixth series of samples by the second set of function values and outputting a third series of products; a fourth digital mixer coupled to the third decimator for receiving the sixth series of samples and multiplying successive subsets of the sixth series of samples by the first set of function values and outputting a fourth series of products; a first summer for subtracting the first series of products from the second series of products, the first summer including: a first non inverting input coupled to the first digital mixer for receiving the first series of products; an first inverting input coupled to the third digital mixer for receiving the third series of products; and a first summer output coupled to the second decimator for outputting the third series of samples; a second summer for summing the second series of products and the fourth series of products, the second summer including: a second non inverting input coupled to the second digital mixer for receiving the second series of products; a third non inverting input coupled to the fourth digital mixer for receiving the fourth series of products; and a second summer output for outputting a sequence of sums; a fourth decimator coupled to the second summer output for receiving the sequence of sums and outputting a seventh series of samples. 9. The receiver according to claim 8 wherein: the second decimator comprises: a first filter characterized by a impulse response shape that approximates a shape of a base band signal that is embedded in the first series of samples; the fourth decimator comprises: a second filter characterized by a impulse response shape that approximates a shape of a base band signal that is embedded in the fifth series of samples. 10. The receiver according to claim 9 wherein: the second rate is between about 10 and 30 times a Nyquist rate of the base band signal. 11. The receiver according to claim 8 wherein: the first set of function values approximate at least a portion of a cycle of a sinusoidal function; and the second set of function values is a circularly shifted v