Abstract:
Disclosed is an optical multichannel transmission and/or reception module, in particular for high-bitrate digital optical signals, with a housing having multiple optical input ports and/or optical output ports and containing an electric assembly and an essentially flat opto-electric module connected electrically to the electric assembly. Multiple electro-optic transmission elements and/or multiple opto-electric reception elements are located on or in the opto-electric module. The opto-electric module has an optical coupling area on one of its surfaces that is connected to the respective first ends of multiple optical waveguides. The opto-electric module has multiple optic paths for optical connection of each first end of an optic waveguide with an associated electro-optic transmission element and/or an associated opto-electric reception element.
Abstract:
The invention relates to an optical interference filter device which defines a first periodic filter frequency response between a first filter output port and a filter input port and a second periodic filter frequency response having the same free spectral range as the first periodic frequency response between a second filter output port and the filter input port. The first and second periodic filter frequency responses are shifted versus each other by a predetermined optical frequency distance.
Abstract:
Disclosed is an optical coupler device, especially for monitoring purposes in an optical point-to-point transmission link, which includes a first, a second and a third optical port and is configured to transmit a first optical signal received at the first optical port to the second optical port and to transmit a second optical signal received at the second optical port to the first and third optical port according to a monitoring split ratio with respect to the optical power of the second optical signal, the first and second optical signal having a wavelength lying in a first optical band. The device is further configured to transmit a third and a fourth optical signal received at the third and the second optical port to the respective other optical port, the third and fourth optical signal having a wavelength lying in a second optical band. The device is controllable with respect to the monitoring split ratio and includes a control means adapted to receive a control signal. The control means controls the optical coupler device with respect to the monitoring split ratio such that in a first work the second optical signal is transmitted to the first optical port, only, and in a second work mode a major portion of the optical power of the second signal is transmitted to the first optical port and a minor portion of the optical power of the second signal is transmitted to the third optical port.
Abstract:
A method for facilitating the establishment of a virtual private network in a cellular communication network comprising the steps of: arranging a network interface device in close proximity to a plurality of antennas; identifying an access request from a client device to establish a virtual private network connection through a core network portion by means of the network interface device; determining application information from the client device by means of the net-work interface device; and comparing the application information to a network information of the core net-work portion to determine whether the application information matches the net-work information by means of the network interface device.
Abstract:
A device for producing timing information comprises equipment (101) that extracts first preliminary timing information from a first circular polarized component of a radio signal and second preliminary timing information from a second circular polarized component of the radio signal. The second circular polarized component has an opposite handedness and a time-delay with respect to the first circular polarized component. The device comprises a processing system (102) that produces the timing information based on the first preliminary timing information and/or the second preliminary timing information, and uses stored correction data for reducing the effect of the time-delay on the timing information when using the second preliminary timing information for producing the timing information. Thus, the timing information corresponds to the first preliminary timing information also when the timing information is produced based on the second preliminary timing information.
Abstract:
An apparatus and method for providing a differential latency, DL, between an upstream, US, transmission and a downstream, DS, transmission via an optical transmission link (OTL), said apparatus comprising a measurement unit (2) configured to measure the round trip delays, RTD, of at least two measurement signals having different measurement wavelengths; and a processing unit (3) configured to derive an upstream, US, delay of at least one optical signal at an upstream wavelength from the at least two measured round trip delays, RTD, and to derive a downstream, DS, delay of at least one optical signal at a downstream wavelength from the at least two measured round trip delays, RTD, wherein the differential latency, DL, is calculated on the basis of the derived delays, RTD.
Abstract:
There are provided a system and method of assessing latency of forwarding data packets in virtual environment. The method comprises: generating packet signatures SGD and SGA respectively for departing and arriving data packets; maintaining a first data structure comprising records related to departing packets associated with a first virtual function (VF), each record informative of SGD and registered departure time TD of a given departing packet; responsive to registering arriving time TA of a given monitored arriving packet SGA associated with a second VF, searching the first data structure for a record matching a matching condition SGD=SGA; modifying the matching record to become informative of latency ΔT=TA−TD and adding the modified record to a second data structure; and using data in the second data structure for assessing latency of forwarding packets from the ingress virtual port to the egress virtual port.
Abstract:
A method and an apparatus for providing a flexible secondary data path control, said method comprising the steps of: detecting (S1) a primary data path failure of a primary data path between a customer premise site (3) and a central office site (4); initiating (S2) a corresponding secondary data path if a primary data path failure of said primary data path has been detected; initiating (S3) a measurement of data path characteristics of said initiated secondary path or utilizing constantly monitored data path characteristics of paths for an available secondary data path; and determining (S4) services to be provided via said secondary data path depending on the measured data path characteristics of said secondary data path.
Abstract:
The invention relates to a method for creating a control channel in an optical transmission signal, wherein the optical transmission signal (SDS,i, SUS,i) includes an optical carrier frequency component, a higher frequency modulation component carrying user information to be transported from a first end to a second end of an optical transmission link and a lower frequency modulation component carrying control information, the higher frequency modulation component realizing a user channel and the lower frequency modulation component realizing the control channel, and wherein the lower frequency modulation component is created by amplitude modulation. According to the invention, the lower frequency modulation component includes a binary digital pilot tone signal component which corresponds to a pilot tone signal having a predetermined pilot tone frequency (fi).
Abstract:
A first and second head-end terminal and at least one optical add/drop filter device are connected to form a transmission path. Each head-end terminal is connected through an optical fiber to a western or eastern WDM port of an adjacent optical add/drop filter device, and each optical add/drop filter device is connected, at an eastern or western WDM port, to a western or eastern WDM port of an adjacent optical add/drop filter device. At least one tail-end terminal is connected to each optical add/drop filter device, wherein a first and second channel port of the respective add/drop tail-end terminal is connected to a dedicated first and second channel port of the optical add/drop filter device through a respective optical fiber. The head-end terminals, the optical add/drop filter devices, and the tail-end terminals are adapted to establish bidirectional communication between each tail-end terminal and the first and second head-end terminal.