ADVA Optical Networking Patente

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The present invention provides a performance monitoring device, an optical signal network with performance monitoring, and a performance monitoring method. The performance monitoring device (100) comprises a coherent receiver (10), an analog-to-digital-converter, ADC (20), a digital signal processing module, DSPM (30), and a noise correction module, NCM (40),the receiver (10) having a second bandwidth that is smaller than the first bandwidth (BW1) such that the receiver (10) is configured to output an electrical analog signal (72) with the second bandwidth based on the received optical signal (71) having the first bandwidth,the ADC (20), being configured to generate from the electric analog signal (72) a digital input signal (73) with the second bandwidth ;the DSPM (30) being configured to generate a raw performance monitoring metric, RPMM (74), based on the digital input signal (73);wherein the NCM (40) is configured to generate a performance monitoring metric, PMM (75), based on the digital input signal (73) by compensating distortion in the RPMM (74) caused by the coherent receiver (10) having a smaller bandwidth than the optical signal (71).

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The present invention relates to a method for optimizing performance of a multi-span optical fiber network, wherein each span has an associated optical transmission fiber connected to an associated optical amplifier, wherein gain and output power of the associated optical amplifier are respectively controlled independently, and wherein an amplifier noise figure respectively depends on the gain of the associated optical amplifier wherein each associated optical amplifier is further connected to launch optical signals into a remainder of a corresponding optical transmission line, and wherein the method (20) comprises the steps of:- for each span, computing the amplifier noise figure and a non-linear noise generated in the span based on information about the span (21) and using the computed amplifier noise figure and the computed non-linear noise to compute an optimum launch power (22);- optimizing performance of the multi-span optical fiber network based on the computed optimum launch powers of all spans (23,24).

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There is provided a technique of time-sensitive transmission of Ethernet traffic between source and destination nodes in IET-blind network. The source network node receives expedited and non-expedited Ethernet frames; for each non-expedited Ethernet frame: detects a pre-provisioned designated non-expedited tunnel; segments non-expedited Ethernet frame into a plurality of segments; encapsulates each segment in accordance with the designated non-expedited tunnel, wherein each encapsulated segment comprises a metadata structure added (inserted, prepended or postpended) to a payload and usable for further reassembling the frame at the destination endpoint, and wherein the metadata structure is informative, at least, of sequence numbers of the frame and the given segment and a type of segment indicative of a relative location of the given segment within a sequence of segments from the plurality of segments; and sends the encapsulated segments to the destination network node via the designated non-expedited tunnel.

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The present invention refers to a system installed in a cross-border area between a public network (120) of a provider and a carriers carrier network (110) of a customer, the system comprises at least:- a smart optical network termination device, NT, (10) that sits on a site of the customer and implements a demarcation point between the customer network (110) and the provider network (120),- a monitoring unit, MU, (20) located at a point of presence, PoP, (122) of the provider network (120),wherein the smart optical NT (10) is configured to monitor a coupling of optical power by the customer into the provider network (120) and to interact with the MU (20) via at least one traffic analysis point, TAP, (31, 32) for connectivity validation from the PoP (122) to the demarcation point (10).The present invention also refers to a respective method.

There is provided a technique of securing clock synchronization between master clock node (MCN) and client clock node (CCN). During a cycle of exchanging PTP messages between MCN and CCN, MCN generates an associated paired message for each PTP message generated thereby and informative of t₁ or t₄ timestamps provided by MCN and sends each paired message to a validation entity (VE) via a secured channel between MCN and VE. When PTP messages traverse transparent clock nodes (TCN) between MCN and CCN, each TCN generates a paired message for each version of PTP message updated thereby and sends each generated paired message to VE via a secured channel between respective TCN and VE. VE uses the received paired messages to provide a validation of the cycle, wherein synchronization-related task(s) (e.g. clock correction by the client clock node, etc.) are provided only subject to successful validation of the cycle by VE.

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The invention relates to a method for interrogating at least one optical sensor (120) that is provided within or connected to an optical path (118) at a sensor position, the optical path (118) connecting the optical sensor (120) to a near end of the optical path (118), wherein the at least one optical sensor (120) has a known frequency-dependent course of its reflectivity that is changed by a physical parameter to be sensed, especially the temperature or humidity of the environment surrounding the at least one optical sensor (120) or the pressure being exerted onto the at least one optical sensor (120). The method comprises the steps of: Feeding at least two optical probe signals (S_probe,i) having differing optical center frequencies to the near end of the optical path (118), wherein the at least two optical probe signals (S_probe,i) are time-shifted versus each other in a predetermined manner when being fed to the near end of the optical path (120), or wherein a predetermined time shift between the at least two optical probe signals (S_probe,i) or corresponding optical reflection signals (S_ref,i) is introduced within the optical path (118) or within an optical receiver (104) using a chromatic dispersion generating component (124); detecting reflected optical power portions of the at least two probe signals (optical reflection signals (S_ref,i)) created by the at least one optical sensor (120) depending on its frequency-dependent course of the reflectivity and the optical frequencies of the at least two optical probe signals (S_probe,i), assigning each optical reflection signal (S_ref.i) detected to one of the at least one optical sensor (120) and assigning the correct optical frequency to each optical reflection signal (S_ref,i) detected using a known round-trip delay of the at least two optical probe signals (S_probe,i) between the near end and the respective sensor position and/or using the time shift relation between the at least two optical probe signals (S_probe,i); and determining an absolute value or a value range or a change of a value or value range of the parameter to be sensed from the presence of one or more of the optical reflection signals (S_probe,i) or the maximum optical power or the optical energy thereof, from the frequency-dependent course of the reflectivity of the at least one optical sensor (120) and its dependency on the parameter to be sensed, and from the optical frequency of each of the optical reflection signals (S_ref,i) detected or from one or more dependencies that link these physical conditions. The invention further relates to a device (100) for carrying out the method.

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An apparatus (1) comprising hardware equipment (3) having hardware components (10) enclosed by a chassis (2) having a front side (2A) and a rear side (2B), and auxiliary equipment (5) movable within the chassis (2) along at least one transportation rail (7) with a non-linear trajectory extending in horizontal plane between a first position at the front side (2A) of the chassis (2) and a second position behind the hardware equipment (3) at the rear side (2B) of the chassis (2), wherein a part of the hardware components (10) is at least temporarily removable from the chassis (2) or movable within the chassis (2) to provide space (11) for moving the auxiliary equipment (5) within the chassis (2) along the at least one transportation rail (7) between the first and second position.

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There are provided a method of time delivery in a computer system comprising a system call interface (SCI) located in a kernel space and operatively connected to a time client located in a user space. The method comprises: using a time agent component located in the user space to measure data indicative of delay in a system time delivery and to derive therefrom a system time delivery error TE_S2C; using TE_S2Cto enable correction of system time; and sending by the SCI the corrected system time in response to a "Read Clock RT" (RCRT) call received from the time client. The method can further comprise: measuring data indicative of delays in the system time delivery for RCRT calls with different priorities; and in response to a system time request received from the time client, providing the time client with system time corrected per TE_S2Ccorresponding to the recognized priority thereof.

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