Patent application number | Description | Published |
20080226287 | Method and Apparatus for Restoration of Operating Conditions of an Optical Ring Network Comprising a Plurality of Optical Amplifiers After a Break or Other Fault in the Ring Network - A method and apparatus for restoration of operating conditions of a WDM optical ring network comprising a plurality of amplifiers linked together in a ring after a break or fault has occurred in the network. The method comprises in response to repair of the break or other fault, increasing output power or/and pump power of an amplifier in the network such that the output power or/and pump power increases substantially in accordance with a ramp function. | 09-18-2008 |
20080273831 | Optical Logic Gate - An optical logic gate ( | 11-06-2008 |
20100033786 | Optical Waveguide Having Bistable Transmission States Suitable for Optical Logic Circuits - An optical circuit comprises a bistable optical waveguide ( | 02-11-2010 |
20100033807 | Optical Switch Assembly and Network Incorporating Same - An optical switch assembly comprising at least two optical amplifiers ( | 02-11-2010 |
20100316377 | ETHERNET TRANSMITTER APPARATUS - An optical transmitter apparatus capable of a transmission rate of at least 100 gbit/second comprises at least three input transmitters that each provide at an output an NRZ optical signal, at least two of the NRZ optical signals having substantially the same bit rate, each of the signals having a bit rate which is less than 100 Gbit/s and the sum of the bit rates of all of the at least three transmitters being at least equal to 100 Gbit/s, an NRZ to RZ converter associated with each transmitter which converts each NRZ signal into an optical RZ signal with the signal remaining in the optical domain during conversion, the optical RZ signal having the same bit rate as the corresponding NRZ signal, an optical time division multiplexer which converts the RZ signals into at least two further signals, one of the further signals being formed by bitwise interleaving the bits of the at least two of the RZ signals which have the same bit rate, and a polarisation multiplexer which processes the two further signals to provide two output signals of differing polarisation, each of the two output signals having the same bit rate as a respective one of the two further signals. The NRZ to RZ converters may be implemented using a SOA based device. | 12-16-2010 |
20110069362 | OPTICAL SIGNAL PROCESSING - Optical signal processor ( | 03-24-2011 |
20110110671 | Optical Networks - Improvements in or relating to Optical Networks. The invention relates to improvements in or relating to optical networks, and methods and an apparatus for providing communications services. Receiving an optical signal is described comprising a carrier wavelength and optical data. The optical data is substantially erased, and the carrier wavelength is re-modulated with user data for onward transmission of the user data. | 05-12-2011 |
20110122470 | OPTICAL FLIP-FLOP - An optical flip-flop comprises first ( | 05-26-2011 |
20110170878 | APPARATUS AND METHOD FOR GENERATING OPTICAL PULSES - An apparatus and method for generating a train of optical pulses. The apparatus comprises an optical resonant cavity ( | 07-14-2011 |
20110234436 | OPTICAL ANALOGUE TO DIGITAL CONVERTER - An analogue to digital converter ( | 09-29-2011 |
20120121262 | SYNCHRONOUS PACKET SWITCHES - A synchronous packet switch comprises output modules, input modules, optical connections and a switch control unit. The output modules comprise optical receivers each configured to receive optical signals at a different wavelength. The input modules receive electric signals carrying data cells to be routed. Each input module comprises optical transmitters, each configurable to generate an optical signal at a different wavelength, and routing apparatus comprising output ports. Each output module has at least one output port allocated to it. The routing apparatus is configurable to route a received optical signal to a selected output port. The optical connections are arranged to couple output ports to respective output modules. The switch control unit controls routing of the optical signals from the transmitters to the output modules and generates a routing control signal for configuring the routing apparatus to route an optical signal from a transmitter to a selected output port. | 05-17-2012 |
20120219290 | OPTICAL LINEAR FEEDBACK CIRCUIT - An optical linear feedback circuit has an optical loop delay path ( | 08-30-2012 |
20140348514 | METHOD OF CONVERTING AN OPTICAL COMMUNICATIONS SIGNAL AND AN OPTICAL RECEIVER - A method of converting an optical communications signal having a differentially encoded multilevel modulation format into communications traffic bits, the multilevel modulation format having a plurality of constellation points, the method comprising: receiving a consecutive pair of symbol signals of said optical communications signal, the pair of symbol signals being arranged to differentially encode a plurality of communications traffic bits; and generating a plurality of optical binary signals in dependence on the symbol signals, each optical binary signal having a respective binary signal level, wherein the optical binary signals form optical versions of the encoded communications traffic bits. | 11-27-2014 |