Abstract:
The invention comprises a photonic crystal fiber (PCF) assembly comprising a PCF and at least one ferrule structure. The PCF has a center axis and comprises a core region and a cladding region and a first fiber end section with a first fiber end. The ferrule structure has a center axis and is mounted to the first fiber end section. The ferrule structure comprises an inner ferrule arrangement and an outer ferrule arrangement surrounding the first fiber end section. The inner ferrule arrangement comprises an inner ferrule front section proximally to the first fiber end and an inner ferrule rear section distally to the first fiber end, and each of the inner ferrule sections have an inner diameter and in at least a length thereof fully surrounds the PCF. The inner ferrule rear section is anchored in an anchor length section to the first fiber end section and the inner ferrule front section supports the first fiber end section proximally to the first fiber end.
Abstract:
An optical fibre that use index-guidance formed with a low index cladding or a microstructured cladding using voids/holes or low index features (404) together with multiple high index resonant cladding features (1205, 1206). One to three resonant cross sectional extending structure act as a filter by resonantly coupling light out to part of the cladding (1202) or other structures (fx. a high index outer cladding ring) that acts as light sink(s) at one to three wavelength when using one to three materials or features with different size, shape, refractive index profile or normalized frequency parameter. The fibre can be asymmetrical. The fibre can be adapted for suppression of higher order modes (HOM) and/or guiding light in a narrow spectral wavelength range and act as a band pass filter. For enhancing out-coupling the high index features can be arranged along two intersecting lines tangentially positioned in relation to the core and along a line that extends from the core and intersects the tangentially positioned lines. Light absorbing material such as samarium can be used in the light sink. The fibre can be used in a fibre amplifier or fibre laser.
Abstract:
The invention concerns a Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and comprises a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region comprises a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF comprises hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further comprises a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50 °C, preferably 50 °C
Abstract:
The invention concerns a Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and comprises a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region comprises a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF comprises hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further comprises a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50° C., preferably 50° C.
Abstract translation:本发明涉及一种光子晶体光纤(PCF)及其制造方法以及一种包含这种PCF的超连续光源。 PCF具有纵向轴线并且包括沿所述纵向轴线的长度延伸的芯部和围绕芯部的包覆区域。 至少包层区域包括多个沿至少一个微结构长度部分中的PCF的纵向轴线延伸的夹杂物形式的微结构。 在微结构长度段的至少耐退化长度段中,PCF包含氢和/或氘。 在至少抗降解长度段中,PCF进一步包括围绕包覆区域的主涂层,该主涂层在低于Th的温度下对于氢气和/或氘是气密的,其中Th为至少约50℃,优选50 °C
Abstract:
An optical fiber for guiding an optical signal, said optical fiber having a longitudinal, optical axis and a cross section perpendicular thereto, said optical fiber comprising: a core region being capable of guiding an optical signal in a fundamental core mode with an effective refractive index, n c , at an optical signal wavelength, λ 1 ; a cladding region surrounding the core region, the cladding region comprising an inner cladding region and an outer cladding region, said inner cladding region comprising a background material having a refractive index, n b , and a plurality of inner cladding features arranged in said background material, wherein at least a plurality of said plurality of inner cladding features are of a first type of feature, said first type of feature comprising an air hole surrounded by a high-index region comprising a high-index material having a refractive index, n r , that is larger than the refractive index of the inner cladding background material, said first type of feature supports an optical mode with an effective refractive index, n 1 , which is lower than or equal to the effective refractive index of the fundamental core mode, n c , at said optical signal wavelength, λ 1 .
Abstract:
An optical fibre that use index-guidance formed with a low index cladding or a microstructured cladding using voids/holes or low index features (404) together with multiple high index resonant cladding features (1205, 1206). One to three resonant cross sectional extending structure act as a filter by resonantly coupling light out to part of the cladding (1202) or other structures (fx. a high index outer cladding ring) that acts as light sink(s) at one to three wavelength when using one to three materials or features with different size, shape, refractive index profile or normalized frequency parameter. The fibre can be asymmetrical. The fibre can be adapted for suppression of higher order modes (HOM) and/or guiding light in a narrow spectral wavelength range and act as a band pass filter. For enhancing out-coupling the high index features can be arranged along two intersecting lines tangentially positioned in relation to the core and along a line that extends from the core and intersects the tangentially positioned lines. Light absorbing material such as samarium can be used in the light sink. The fibre can be used in a fibre amplifier or fiber laser.
Abstract:
A photonic crystal fiber (PCF) assembly comprises a PCF and at least one ferrule structure, said PCF has a center axis and comprises a core region and a cladding region and a first fiber end section (21) with a first fiber end (21a), said ferrule structure has a center axis and is mounted to said first fiber end section (21), the PCF center axis at the first fiber end section (21) and the ferrule structure center axis being parallel or coincident, said ferrule structure comprises an inner ferrule arrangement and an outer ferrule arrangement (5) surrounding the first fiber end section (21), said inner ferrule arrangement comprises an inner ferrule front section (22) proximally to said first fiber end (21a) and an inner ferrule rear section (23) distally to said first fiber end (21a), said inner ferrule front section (22) and said inner ferrule rear section (23) are not directly fixed to each other and the outer ferrule arrangement is configured to hold the inner ferrule front section and the inner ferrule rear section in position relative to each other, each of said inner ferrule sections (22, 23) have an inner diameter and in at least a length thereof fully surrounds the PCF, said inner ferrule rear section (23) is anchored in an anchor length section (23b) to said first fiber end section (21) and said inner ferrule front section (12) supports said first fiber end section (21) proximally to said first fiber end (21a), wherein said first fiber end section (21) has at least one mode stripper length section (27, 37), and wherein said mode stripper length section (27, 37) comprises a mode stripping high index material and/or a scattering layer applied in contact with the PCF at said mode stripper length section (27, 37) and/or said fiber in said mode stripper length section (27, 37) has a roughness Ra value of at least about 0.1 µm.
Abstract:
The invention comprises a photonic crystal fiber (PCF) assembly comprising a PCF and at least one ferrule structure. The PCF has a center axis and comprises a core region and a cladding region and a first fiber end section with a first fiber end. The ferrule structure has a center axis and is mounted to the first fiber end section. The ferrule structure comprises an inner ferrule arrangement and an outer ferrule arrangement surrounding the first fiber end section. The inner ferrule arrangement comprises an inner ferrule front section proximally to the first fiber end and an inner ferrule rear section distally to the first fiber end, and each of the inner ferrule sections have an inner diameter and in at least a length thereof fully surrounds the PCF. The inner ferrule rear section is anchored in an anchor length section to the first fiber end section and the inner ferrule front section supports the first fiber end section proximally to the first fiber end.
Abstract:
An optical fibre that use index-guidance formed with a low index cladding or a microstructured cladding using voids/holes or low index features (404) together with multiple high index resonant cladding features (1205, 1206). One to three resonant cross sectional extending structure act as a filter by resonantly coupling light out to part of the cladding (1202) or other structures (fx. a high index outer cladding ring) that acts as light sink(s) at one to three wavelength when using one to three materials or features with different size, shape, refractive index profile or normalized frequency parameter. The fibre can be asymmetrical. The fibre can be adapted for suppression of higher order modes (HOM) and/or guiding light in a narrow spectral wavelength range and act as a band pass filter. For enhancing out-coupling the high index features can be arranged along two intersecting lines tangentially positioned in relation to the core and along a line that extends from the core and intersects the tangentially positioned lines. Light absorbing material such as samarium can be used in the light sink. The fibre can be used in a fibre amplifier or fibre laser.