Abstract: A dual E/O transmitter module optical transponder comprising an E/O receiver module capable of converting an ingressing optical signal from an optical signal source to an electrical signal, a pair of E/O transmitter modules connected in parallel and each capable of converting the electrical signal to an egressing optical signal, a control device for enabling one of the pair of E/O transmitter modules and disabling the other of the pair of E/O transmitter modules, and an optical coupler coupled to the pair of E/O transmitter modules for feeding the egressing optical signal from the enabled E/O transmitter module to an optical signal destination.

Abstract: A method, a system and a device for encrypting an optical signal to be transmitted via an optical fiber communication link by causing controlled chromatic dispersion of said signal. The controllable decryption device, as well as the controllable decryption device, can be implemented in the form of a variable dispersion compensation module controlled by a decryption key. In the system, the encryption device and the decryption device are controlled in synchronism by an encryption key and a decryption key respectively, the keys preferably being functions of time symmetric with respect to the time axis.

Abstract: A method and a generator are described for high speed generation of an S-bit long pattern of a PRBS sequence to be periodically burst on to a bus of width S. The technique provides the calculation time being independent from the width S of the bus, and comprises calculation of all S bits of the PRBS pattern separately and in parallel by using previous PRBS patterns stored in a memory. For each bit to be generated, the generator performs a constant number N of logical operations required (by a polynomial defining the PRBS sequence.

Abstract: There is proposed a technique for counting channels at a node of a multi-channel optical network, where the node is connected to a following node and a preceding node by an optical communication line carrying a plurality of information optical channels. The technique comprises exchanging of information structures between the nodes, such that each of the information structures specifies particular optical information channels which are currently in use at a predetermined network section or node.

Abstract: Apparatus for determining occurrence of a failure in an optical transport network (OTN), is provided. The apparatus is adapted to be associated with a synchronous communication equipment.

Abstract: An optical communication switch operative in a communication network which is adapted to enable protection of a segment, or a number of segments, along an optical path in the communication network.

Abstract: A method for enabling provision of service-levels in an Ethernet-over-synchronous communication network, the method comprising:

Abstract: A method for diverting communication traffic in an optical network from a first optical link extending between a first and a second locations, to a second optical link extending either directly between the first and the second locations or via a third location, which method comprises the steps of switching traffic at said first location from said first optical link to said second optical link. After determining at the second location that traffic has not been received along the first optical link for a pre-determined period of time, traffic is diverted at the second location to the second optical link.

Abstract: A technique for handling an optical pulse signal, wherein the handling includes one or more operations out of: pulse shaping, treatment of nonlinearity and monitoring; the technique uses a device capable of performing a cascaded second harmonic generation (SHG) with respect to a particular fundamental harmonic (FH), and comprises:

Abstract: A method for use in a distributed system that includes a server managing a master volume of data including a plurality of static attributes and at least one dynamic attribute whose prevailing values in the master volume of data are respectively updated and not updated as a consequence of a command from a client, and at least two clients each managing a volume of data intended to mirror the master volume of data. The method provided, enables data mirroring restoration at a client freshly reconnected to the server after a communication downtime period.