Abstract:
Methods, systems, and apparatus, for an external cavity FP laser. In one aspect, an apparatus is provided that includes a FP laser diode; a Faraday rotator (FR) coupled to receive an optical output of the FP laser diode and that rotates a polarization of the optical output; an optical fiber coupled at a first end to receive the output of the FR; a WDM filter coupled to a second end of the optical fiber to receive the optical signal from the optical fiber; and a FRM coupled directly or indirectly to an output of the WDM filter, wherein an optical output of the WDM filter is partially reflected by the FRM such that the polarization of a reflected beam is rotated, and wherein the reflected optical signal then passes through the FR with its polarization being rotated by the FR before it is injected back into the FP laser diode.
Abstract:
La présente invention se rapporte à un dispositif lumineux réfléchissant destiné à un réseau d'accès optique WDM PON comprenant une source lumineuse avec un milieu de gain optique. Le dispositif lumineux (OD) comprend une source lumineuse avec un milieu de gain optique (Opt Gain), dont la longueur d'onde s'auto accorde lors d'un aller retour optique entre le milieu de gain optique et un composant optique réflectif (ORC) délimitant la cavité laser. Le composant optique réflectif est composé d'un amplificateur optique (PA) associé selon un montage optique réflectif à un dispositif polarisant (PD) pour que l'axe de polarisation de la lumière réfléchit soit le même que celui de la lumière émise.
Abstract:
Methods and apparatus are described for RFoG CPE devices with wavelength collision avoidance using local and/or remote tunability. A method includes tuning each of a plurality of optical transmitters to a plurality of non-overlapping frequency bands to avoid wavelength collisions in an upstream portion of a multipoint-to-point RFoG network where multiple optical transmitters from different RFoG CPE units transmit at the same time to a single shared optical receiver.
Abstract:
201002029 22 Abstract Processing data in an optical network A method devices for processing data in an optical network 5 are provided, wherein a centralized component is connected to several decentralized components; wherein first data is conveyed from the centralized component to at least two de- centralized components, wherein the at least two decentral- ized components share an optical resource; and wherein sec-10 ond data is conveyed from the decentralized component to the decentralized component via at least one separate opti- cal resource. Furthermore, a communication system is sug- gested comprising said device. 15 Fig.3
Abstract:
The invention relates to a method for operating an optical transmission line with several transmission channels for communication of several optical transmitters with several optical receivers using different wavelengths (lambda1 to lambda20), where to each optical receiver an optical transmission channel is assigned, wherein to each transmission channel a set of different wavelengths (lambda1, lambdas, lambda9...; lambda2, lambda6, lambda10...;...) is assigned, wherein each wavelength is assigned to one set of different wavelength only, wherein the wavelengths of each set of wavelengths are spread over an area of wavelength (lambda1 to lambda20) commonly permitted to all sets of wavelengths, wherein to each optical receiver is assigned a set of optical filters that pass the wavelengths of one set of wavelengths, and wherein each optical transmitter chooses a wavelength from the set of wavelengths assigned to it that is usable for it with small effort, as well as to an optical transmission system, an optical transmitter, a set of optical filters, and an optical filter device.
Abstract:
Optical fiber-based distributed communications components and systems, and related methods employing wavelength division multiplexing (WDM) for enhanced upgradability are disclosed. In one embodiment, the system comprises a plurality of downlink optical transmitters configured to receive downlink electrical radio frequency (RF) signals from a plurality of RF sources and convert the downlink electrical RF signals into downlink optical RF signals. The system also comprises a wavelength division multiplexer configured to multiplex downlink optical RF signals into a plurality of downlink wavelengths over a common downlink optical fiber connected to a plurality of remote antenna units (RAUs). In this manner, additional downlink optical fibers are not required to support providing additional RAUs in the system. The systems and methods disclosed in the detailed description can also include wavelength-division de-multiplexing to avoid providing additional uplink optical fibers to distribute uplink optical signals to RAUs added in the system.