Abstract:
The invention relates to a WDM optical communication system, which is used in an optical transmission path including a dispersion-shifted optical fiber having zero-dispersion wavelength in a 1.55 mu m band and effectively controls the waveform deterioration attributed to optical nonlinearity of signal light in a 1.58 mu m band. The WDM optical communication system includes a hybrid transmission unit having a single-mode optical fiber and a dispersion-shifted optical fiber along the path of the signal light. The single-mode optical fiber has zero-dispersion wavelength in a 1.3 mu m band, and has an effective cross-sectional area ASMF at a wavelength of 1.58 mu m. The dispersion-shifted optical fiber has zero-dispersion wavelength in a 1.55 mu m band, and has dispersion whose absolute value is greater than 0.5 ps/nm/km at a wavelength of 1.58 mu m and an effective cross-sectional area ADSF smaller than the sectional area ASMF of the single-mode optical fiber.
Abstract:
The invention relates to a cost-effective solution for compensating the dispersion of optical signals with different wavelengths. According to the invention, photonic crystals (K1-Kn) are arranged on a common optical waveguide (2). Each photonic crystal (K1-Kn) is set in such a way that it reflects or deflects the signals of one wavelength and allows the signals of other wavelengths to pass through unattenuated. The actual arrangement of the photonic crystals (K1-Kn) on the optical waveguide (2) and the actual arrangement of the deflective elements in the photonic crystal are determined according to the dispersion which is to be compensated between the individual wavelengths. The inventive solution enables high-quality photonic dispersion compensators which are approximately 1000 times shorter than conventional diffraction gratings to be set or adjusted in a fixed manner.
Abstract:
An optical device (2) having a number of waveguides (12), an input port (6) coupled to the waveguides (12) such that light incident on the input port (6) is split for propagation on the waveguides, and an output port (10) receiving light propagated on the waveguides (12) at a point on an output plane of incidence. The waveguides (12) induce respective delays in the propagated light to induce a wavelength dependent group delay. Delays between adjacent waveguides are chosen to be non-constant, to introduce quadratic, cubic or higher-order phase differences between different waveguides. Applications include dispersion compensation, pulse compression, and passband broadening in arrayed waveguide grating multiplexers and demultiplexers.
Abstract:
A method (200) of controlling compensation of chromatic dispersion in an optical transport network. The method comprises determining (202) whether a residual dispersion, RD, of a first path (3) within the network is within a defined RD range and if the RD of the first path is outside the defined RD range the method comprises identifying (204) a first tuneable dispersion compensation module, TDCM, crossed by the first path (3), configured to apply a respective value of dispersion compensation. The method also comprises determining (206) a different value of dispersion compensation to be applied by the first TDCM to bring the RD of the first path within the defined RD range; if (208) the first TDCM is crossed by at least one other path (1, 2), checking (210) that the respective RD of said at least one other path is within a respective defined RD range for said different value of dispersion compensation; and generating (212) a control signal comprising instructions configured to set the first TDCM to apply said different value of dispersion compensation.
Abstract:
A data communication cable assembly including a cable with wire and/or optical fiber communication mediums for transmitting data signals and/or power signals, and connectors for connecting to a pair of devices, respectively. Each of the connector includes a connector plug or receptacle configured to mate with a corresponding receptacle or plug of a device, wherein the connector plug or receptacle includes a set of electrical contacts configured to send and/or receive the data signals and/or power signals to and/or from the device; a metallic shell defining an enclosure and including first and second openings, wherein the connector plug or receptacle mate is configured to mate with the corresponding receptacle or plug of the device via the first opening, and wherein the cable extends from inside to outside of the enclosure via the second opening; and electrically-conductive filler material configured to reduce electromagnetic leakage via the first and second openings.