Abstract: A light source system for delivery of light including a light source having an output arranged to emit light in an output path, the output path including an unguided section and an at least partially transmissive optical component wherein the optical component provides at least one residual reflection when the system is in use and a detector system is arranged to detect said residual reflection. The detector is in one embodiment arranged to produce at least one feedback response arranged to stabilize the optical output of the light source system. Hereby a feedback may be implemented with little or no reduction of performance.

Abstract: The invention relates to an optical system arranged to provide an output which, in operation, comprises at least one figure of merit, Q. The system comprises an optical component having multiple working areas, said component being mounted on a support member. The system further comprises an optical beam path arranged to bring light into interaction with at least one working area of the optical component wherein the position of said working area(s) may be selected by relative movement between said path and said component while keeping Q substantially unaffected by said movement.

Abstract: The invention relates to an optical system arranged to provide an output which, in operation, comprises at least one figure of merit, Q. The system comprises an optical component having multiple working areas, said component being mounted on a support member. The system further comprises an optical beam path arranged to bring light into interaction with at least one working area of the optical component wherein the position of said working area(s) may be selected by relative movement between said path and said component while keeping Q substantially unaffected by said movement.

Abstract: A light source system for delivery of light including a light source having an output arranged to emit light in an output path, the output path including an unguided section and an at least partially transmissive optical component wherein the optical component provides at least one residual reflection when the system is in use and a detector system is arranged to detect said residual reflection. The detector is in one embodiment arranged to produce at least one feedback response arranged to stabilize the optical output of the light source system. Hereby a feedback may be implemented with little or no reduction of performance.

Abstract: An inverse dispersion fiber is provided that has a relatively low fiber loss, a relatively low fiber splice loss and a relatively large effective mode-field area. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, for example, approximately 0.709%<(n1−n2)/n2<1.0%, approximately −0.358%<(n3−n2)/n2<−0.293%, approximately 0.194%<(n4−n2)/n2<0.237%, and approximately −0.045%<(n5−n2)/n2<−0.037%.

Abstract: An inverse dispersion fiber is provided that has a relatively low fiber loss, a relatively low fiber splice loss and a relatively large effective mode-field area. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, for example, approximately 0.709%<(n1−n2)/n2<1.0%, approximately −0.358%<(n3−n2)/n2<−0.293%, approximately 0.194%<(n4−n2)/n2<0.237%, and approximately −0.045%<(n5−n2)/n2<−0.037%.

Abstract: Applicants have discovered the existence of loss peaks in optical fiber transmission systems using wavelengths in the E-band and the L-band. Specifically, they have discovered the existence of narrow loss peaks at 1440 nm, 1583 nm and 1614 nm. Because the peaks are relatively narrow, they cannot be easily removed by conventional gain equalizers in long haul transmission systems, and although the peaks are relatively small, they can nonetheless cause transmission channels to drop out in amplified DWDM transmission systems. Applicants have further discovered that these loss peaks are due to carbon contamination of the transmission fiber. Thus optical fibers should be fabricated essentially free of carbon contamination. This means eliminating carbon-containing reagents in preform and tube-making processes.

Abstract: Embodiments of the invention include an optical communications system with optical fiber cable, coupled between optical transmission and receiving devices, having positive dispersion fiber and corresponding inverse dispersion fiber. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, e.g., 0.745%<(n1−n2)/n2<0.759%,−0.403%<(n3−n2)/n2<−0.394%, 0.152%<(n4−n2)/n2<0.166%, and −0.083%<(n5−n2)/n2<−0.041%.

Abstract: Embodiments of the invention include an optical communications system with optical fiber cable, coupled between optical transmission and receiving devices, having positive dispersion fiber and corresponding inverse dispersion fiber. The inverse dispersion fiber includes a doped core region with an index of refraction n1, a cladding region with an index of refraction n2, and a trench region, a first barrier region and a second barrier region with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, e.g., 0.745%<(n1−n2)/n2<0.759%, −0.403%<(n3−n2)/n2<−0.394%, 0.152%<(n4−n2)/2<0.166%, and −0.083%<(n5−n2)/n2<−0.041%.