Abstract:
Quasi-single mode optical waveguide fibers are disclosed that are bend resistant and capable of providing single mode transmission, for example at wavelengths greater than 1260 nm when the fundamental mode of optical energy is launched into the core of the fiber. Optical fiber line incorporating quasi-single mode optical waveguide fiber is also disclosed. Jumpers, or patchcords, utilizing quasi-single mode optical waveguide fiber are also disclosed herein.
Abstract:
An optical system comprises an optical fiber with gain producing core with an index of refraction n 1 , surrounded by at least one cladding with an index of refraction n 2 , said cladding including at least one index reduced area with an index of refraction n 2 , such that n 1 >n 2 >n 2 , the core propagating signal at a spatial fundamental mode at a signal wavelength ? 1 and at a power level sufficient to generate optical power at a wavelength ? 2 , where ? 2 > ? 1 , and the optical fiber has at least one cut-off fundamental spatial mode wavelength ? c , and ? 1 c and ? 2 >? c .
Abstract:
The present invention provides devices and methods for dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber having an input configured to receive the optical signal, the negative dispersion fiber having a length and dispersion sufficient to remove any positive chirp from each wavelength channel of the optical signal, thereby outputting a negatively chirped optical signal; an amplifying device configured to amplify the negatively chirped optical signal; and a nonlinear positive dispersion fiber configured to receive the negatively chirped optical signal. The devices of the present invention provide broadband compensation for a systems having a wide range of variable residual dispersions.
Abstract:
An optical channel shared protection ring (20) including multiple ring nodes (102, 104, 106, 108), the nodes including optical switch or crossbar capability for performing ring switching for end-node protection switching for wavelengths that may be dropped and added and a non-intrusive optical channel monitor (22, 62) at least on each working channel both on the add and drop side of the node, such that a monitor is always present at both a head-end location where traffic is introduced to the ring and at a tail end location where traffic leaves the ring, so as to be able to trigger end-node protection switching performed by the head-end and tail-end nodes based on the condition of absence of adequate signal at both the head-end and the tail-end location, thus avoiding unnecessary protection switching.
Abstract:
Methods, systems, and devices for non-invasive measurement of cell cultures are described that provide for remote monitoring of cell status. The system includes a cell culture vessel, at least one monitoring layer, at least one measurement device, and a communication component. The cell culture vessel may include at least one cell culture chamber configured for cell growth and for closed-system operation. The monitoring layer is external to the at least one cell culture chamber. In some cases, the communication component is configured to transmit data from the monitoring layer to a remote location.
Abstract:
fibra com área real ampla e núcleo isento de ge de acordo com alguns concretizações , uma fibra de guia de ondas ópticas compreende: (i) um núcleo isento de ge com uma área real de 90 m^ 2^ a 160 m^ 2^, em um comprimento de onda de 1.550 nm, e um valor de onde 12 , o referido núcleo compreendendo: (a) uma região de núcleo central , a qual se estende radialmente para fora de uma linha central a um raio r onde 0 r 2 e possui um perfil percentual do índice de refração relativo, (r) em , medido em relação à sílica pura onde -0,1 (r) 0,1 , em que a região de núcleo central possui um percentual máximo do índice de refração relativo ~ max~ (b) uma primeira região de núcleo anelar, a qual circunda e é diretamente adjacente à região de núcleo central, estende-se a um raio externo, r~ 1~ onde 4,8 r~ 1~ 10 e possui um perfil percentual do índice de refração relativo, ~ 1~(r) em % , medido em relação à sílica pura, bem como um índice de refração relativo mínimo ~ 2~~ min~, onde o índice dde refração relativo medido a um raio r = 2,5 é : -0,15 ~ 1~(r =2,5 ) 0 e ~ 0~~ max~ ~ 1~( r = 2,5 ); (c) uma segunda região anelar dopada com flúor , a qual circunda e é diretamente adjacente à primeira região de núcleo anelar , estende-se a um raio r~ 2~ onde 13 r~ 2~ 30 e possui um perfil percentual negativo do índice de refração relativo, ~ 2~(r) em %, medido em relação à sílica pura, onde um percentual mínimo do índice de refração relativpo de refração relativo ~ 2min~ é: ~ 2min~ ~ 1~(r=2,5 ) e 0,7 ~ 2min~ -0,28 ; (ii) um revestimento, o qual circunda o núcleo e possui um percentual do índice de refração relativo , ~ c~(r) em , medido em relação à sílica pura onde ~ c~(r) = ~ 2min~ 0,3 ; em que o perfil do índice de refração relativo da fibra óptica é selecionado a fim de conferir uma atenuação que não ultrapasse 0,175 db/km no comprimento de onda de 1.550 nm.
Abstract:
One exemplary multimode optical fiber includes a graded index glass core having a diameter in the range of 41 microns to 80 microns , a graded index having an alpha less than 2.04 and a maximum relative refractive index in the range between 0.6% and 1.8%. The cladding includes a depressed- index annular portion. The fiber has an overfilled bandwidth greater than 2.5 GHz -km at at least one wavelength between 1200 nm and 1700 nm.