摘要:
An apparatus and method for reduction of bit errors in continuous data transmission via a data transmission medium comprising. The apparatus (1) comprises a monitoring unit (1A) for monitoring of transceiver parameters of at least one transceiver (3) transmitting said data and/or medium parameters of said data transmission medium (4) and a calculation unit (1B) for predicting a time and a duration of an occurrence of at least one event affecting a bit error rate (BER) of said continuous data transmission depending on the monitored parameter; and a control unit (1C) for throttling a bandwidth of a data switch (6) connected to said transceiver (3) during the predicted duration of the event for bit error reduction.
摘要:
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 measure-ment 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.
摘要:
An apparatus (1) for performing spectrometric measurements comprises a tunable laser light source (3) for generating laser light with an excitation wavelength, an optical sensor (2) for receiving the laser light and producing a sample specific response light signal; an optical reference filter (7) adapted to pass laser light with the excitation wavelength and feed it back as a reference signal to provide wavelength calibration of the tunable laser light source; at least one optical measurement filter (6) adapted to pass the sample specific response light signal produced by the optical sensor, wherein the optical reference filter and the at least one optical measurement filter are thermally coupled to maintain a constant wavelength relationship between the filter characteristics of the optical filters, a photodetector (5) for converting the sample specific response light signal into an electrical signal, a controller adapted to receive the electrical signal from the photodetector and analyze the receive signal to provide analytical results, and a tuning unit (9) in operative communication with the controller for tuning the excitation wavelength of the tunable laser light source.
摘要:
A method for operating an optical transmission system (1), the method comprising the steps of: (a) generating (S1) for a tunable laser (L) a pilot tone (PT) having an adjustable pilot tone frequency (f PT ) which identifies a wavelength division multiplexing (WDM) channel used by the respective tunable laser (L); (b) multiplying (S2) the generated pilot tone (PT) of said tunable laser (L) with pilot tone data (PTD) to provide a pilot tone data signal (PTDS); (c) supplying (S3) the pilot tone data signal (PTDS) and a high frequency data signal (HFDS) to said tunable laser (L) which generates an optical laser signal (OLS) output by said tunable laser (L) in response to the supplied signals; (d) transporting (S4) said optical laser signal (OLS) to a remote central wavelength locker (3G) via an optical transport medium (5); (e) converting (S5) the received optical laser signal (OLS) by means of a photo diode (PD) of said remote central wavelength locker (3G) to provide a pilot tone data signal (PTDS) for wavelength division multiplexing (WDM) channels which is demodulated to detect the pilot tone (PT) and the pilot tone data (PTD) for each individual wavelength division multiplexing (WDM) channel; and (f) identifying (S6) the wavelength division multiplexing (WDM) channel used by the respective tunable laser (L) on the basis of the pilot tone frequency (f PT ) of the detected pilot tone (PT) and evaluating the pilot tone data (PTD) of the identified wavelength division multiplexing (WDM) channel.
摘要:
The invention relates to a remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network comprising a central node and a plurality of remote nodes serially connected to each other or to the central node, respectively, the central node and the remote node being capable of communicating by means of digital optical signals created by the central node or a respective remote node, each digital optical signal comprising a data frame. The remote node comprises an optical connection network, a single transceiver device comprising an optical receiver unit and an optical transmitter unit, and an electronic controller device for controlling the transceiver device. The optical connection network defines a western optical connection port, an eastern optical connection port, an internal optical receiving port being connected to the optical receiver unit and an internal optical transmitting port being connected to the optical transmitter unit, the western and eastern optical connection ports being connected via an optical pass-through path for passing through a digital optical signal received at the western or eastern optical connection port as digital optical pass-through signal to the respective other optical connection port with at least a portion of the optical power of the received digital optical signal. The controller device, the transceiver device and the optical connection network are designed such that for transmitting information from the remote node to the central node, the controller device creates a data frame including content data supplied to the controller device and address data for addressing the central node and controls the optical transmitter unit such that a digital optical transmit signal according to the data frame is created, the digital optical transmit signal being supplied at least to the optical connection port facing the central node, for receiving information from the central node, the receiver unit receives a digital optical transmit signal created by the central node or a digital optical echo signal created by another remote node, which is supplied to the western or eastern optical connection port and which comprises a data frame including content data and address data for addressing the remote node, with at least a given power portion at the internal optical receiving port, and the controller device processes the respective data frame, and for regenerating a digital optical transmit or echo signal received, the receiver unit receives a digital optical transmit signal created by the central node or a remote node or a digital optical echo signal created by another remote node, which is supplied to the western or eastern optical connection port and which comprises a data frame including content data and address data not addressing the remote node, with at least a given power portion at the internal optical receiving port, the controller device creates an echo data frame including the same content and address data as the received data frame and controls the optical transmitter unit such that a digital optical echo signal according to the echo data frame is created immediately or after a predetermined time interval after the end of the data frame of the received optical signal, the digital optical echo signal being output at the respective other optical connection port or at both optical connection ports. Further, the invention relates to a fiber-optic network architecture having a linear bus structure comprising a central node and a plurality of remote nodes having a respective architecture and to a simple method for transmitting digital data in a respective network architecture.
摘要:
The invention relates to a remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network architecture (1) comprising a central node (3, 7) and a plurality of remote nodes (5) serially connected to each other or to the central node (3,7), respectively, the central node (3, 7) and the remote nodes (5) being capable of communicating by means of digital optical signals created by the central node (3, 7) or a respective remote node (5), each digital optical signal comprising a data frame. The remote node (5) comprises an optical connection network (15, 150), a single transceiver device (17) comprising an optical receiver unit (19) and an optical transmitter unit (21, 210), and an electronic controller device (27) for controlling the transceiver device (17). The optical connection network (15, 150) defines a western optical connection port (11), an eastern optical connection port (9), an internal optical receiving port (23) being connected to the optical receiver unit (19) and an internal optical transmitting port (25) being connected to the optical transmitter unit (21, 210). The controller device (27), the transceiver device (17) and the optical connection network (15, 150) are designed such that for transmitting information from the remote node (5) to the central node (3, 7) or a further selected remote node (5), the controller device (27) creates at least one data frame including content data supplied to the controller device (27) and address data for addressing the central node (3, 7) and controls the optical transmitter unit (21, 210) such that a digital optical transmit signal according to the at least one data frame is created, the digital optical transmit signal being simultaneously supplied to the eastern and western optical connection ports (9, 11). For receiving information from the central node (3, 7) or a further selected remote node (5), the receiver unit (19) receives a digital optical transmit signal created by the central node (3, 7) or the selected further remote node (5) or a digital optical echo signal created by another remote node (5), which is supplied to the western or eastern optical connection port (11, 9) and which comprises at least one data frame including content data and address data for addressing the remote node (5), with at least a given power portion at the internal optical receiving port (23), and the controller device (27) processes the respective at least one data frame. For regenerating a digital optical transmit or regenerated signal received, the receiver unit (19) receives a digital optical transmit signal created by the central node (3, 7) or a remote node (5) or a digital optical regenerated signal created by another remote node (5), which is supplied to the western or eastern optical connection port (11, 9) and which comprises at least one data frame including content data and address data not addressing the remote node (5), with at least a given power portion at the internal optical receiving port (23), and the controller device (27) creates a regenerated data frame including the same content and address data as the received data frame and controls the optical transmitter unit (21, 210) such that a digital optical regenerated signal according to the regenerated data frame is created, the digital optical regenerated signal being simultaneously output to both optical connection ports (11, 9).