Abstract: A transmitter (11) emits a single wavelength optical signal and transmits this as a wavelength channel (13) in a compound multiplex signal through the WDM network. The receiver (12) selects the single wavelength optical signal (21) from the compound multiplex signal using a band-pass filter. A wavelength fit detector (15) determines a feedback signal by correlating variations of the amplitude of the received signal with variations of the traffic density. This feedback signal is then returned to the transmitter (11) via a back channel (16) and serves to tune the wavelength of the single wavelength optical signal.

Abstract: A Laser device for optical packet data transmission in TDM-systems is provided. The device comprises a laser light source for outputting laser light beam and a laser driver for driving the laser light source; an optical modulator which receives and modulates the laser light beam output by the laser light source; a packet data source for outputting a packet data stream; and a modulator driver for receiving the packet data stream output by the packet data source and for driving the optical modulator in response to the packet data stream resulting in that the optical modulator modulates the laser light beam in response to the packet data stream. A filter generates an envelope signal of the data packets in the packet data stream, and a switch switches the laser driver in response to the envelope signal.

Abstract: The invention relates to a method for monitoring an optical transmission line of an optical data network, wherein light is sent into the optical transmission line at a line input, and backscattered light of said light is detected at said line input and analysed, wherein during normal operation of said optical network, burst mode optical signals carrying a digital payload are sent onto the optical transmission line at the line input, and the backscattered light of said burst mode optical signals is detected at said line input and analysed. The inventive method is simple and cost-effective.

Abstract: The present invention relates to a method for transmitting packets comprising a synchronization part (sync?) and a payload part (dat1, dat2), wherein the transmission format comprises a shortened synchronization part (syn?) and the payload part is split into a first data sequence (dat1), encoded in the first encoding, followed by the second data sequence (dat2), encoded in the second encoding, comprising the steps of encoding and sending the first data sequence (dat1) in the first encoding, encoding and sending the second data sequence (dat2) in the second encoding, on the sender side and receiving and decoding the first data sequence (dat1) in the first encoding, detecting the end of the first data sequence and adapting the receiver's decoder, receiving and decoding the second data sequence (dat2) in the second encoding on the receiver side. The invention further relates to a sender, a receiver, an optical network element, and a serialized packet format.

Abstract: The invention relates to a method for monitoring an optical transmission line of an optical data network, wherein light is sent into the optical transmission line at a line input, and backscattered light of said light is detected at said line input and analysed, wherein during normal operation of said optical network, burst mode optical signals carrying a digital payload are sent onto the optical transmission line at the line input, and the backscattered light of said burst mode optical signals is detected at said line input and analysed. The inventive method is simple and cost-effective.

Abstract: A transmitter (11) emits a single wavelength optical signal and transmits this as a wavelength channel (13) in a compound multiplex signal through the WDM network. The receiver (12) selects the single wavelength optical signal (21) from the compound multiplex signal using a band-pass filter. A wavelength fit detector (15) determines a feedback signal by correlating variations of the amplitude of the received signal with variations of the traffic density. This feedback signal is then returned to the transmitter (11) via a back channel (16) and serves to tune the wavelength of the single wavelength optical signal.

Abstract: The invention relates to a laser device for optical packet data transmission. Such devices are basically known in the art and comprise a laser light source for outputting a laser light beam and a laser driver for driving said laser light source. The laser device further comprises an optical modulator means for modulating a packet data stream onto said laser light beam. The optical modulator means presently available on the market, only have a low extinction rate; consequently residual light is output by said optical modulator means, even if a logical zero shall be transmitted.

Abstract: The present invention relates to a method for transmitting packets comprising a synchronization part (sync′) and a payload part (dat1, dat2), wherein the transmission format comprises a shortened synchronization part (syn′) and the payload part is split into a first data sequence (dat1), encoded in the first encoding, followed by the second data sequence (dat2), encoded in the second encoding, comprising the steps of encoding and sending the first data sequence (dat1) in the first encoding, encoding and sending the second data sequence (dat2) in the second encoding, on the sender side and receiving and decoding the first data sequence (dat1) in the first encoding, detecting the end of the first data sequence and adapting the receiver's decoder, receiving and decoding the second data sequence (dat2) in the second encoding on the receiver side. The invention further relates to a sender, a receiver, an optical network element, and a serialized packet format.

Abstract: A method for the asynchronous transmission of data packets in telecommunication networks with a bit rate B is characterized by methoding of the data to be transmitted such that the probability of the occurrence of a 0 or 1 state in the data stream at each bit position is approximately equal and independent of other bit positions (=scrambling); waiting for a guard band time tgb, transmission of a synchronization sequence during time tsy, transmission of a synchronization word during time tco, and transmission of the data payload; detection of a synchronization sequence and synchronization to this in a receiver; detection of the start of the data packet by detection of the synchronization word in the receiver; reception of the data payload in the receiver.

Abstract: A device for determining level values in data flows comprising different level values, is characterized by means for performing the following steps: 1.) detecting the change between different part-data flows or packets, 2.) starting an integration of the next part-data flow, 3.) holding the output value of the integration device, 4.) deriving a level value from the output value of the integration device. Advantages of the invention are short building-up time and thus a better use of the individual channels, especially optical channels.

Abstract: A process for digital message transmission is specified, in which the transmitted signals are sampled at the end of a transmission link by means of a device for timing recovery and are then further processed. In this case the signals are fed to a discriminator simultaneously via two separate paths, a delay path and a path fitted with a filter. A wideband bandpass filter with a relative bandwidth of 0.2% to 0.4% of the bit timing of the transmitted signals is used as a filter, whose transient recovery time is less than the time by which the signals are delayed on the delay path, which in turn is less than the decay time of the bandpass filter. An amplifier limiting the amplitude of the output voltage of the same limiting amplifier via which the timing signals are brought to the required constant level, is connected downstream of the bandpass filter.