| 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 |
| Patent application number | Description | Published |
|---|
| 20090116089 | Optical Logic Device - An optical logic device comprising a first mirror confronting a second mirror, a saturable absorber located between the mirrors and radiation which is output from the device is output via the first mirror, and the reflectivity of the first mirror being such that, in use, for incident radiation which has an intensity that is above a given value, the intensity of exiting radiation is below a threshold, and for incident radiation that is below the given value, the intensity of exiting radiation is above the threshold. | 05-07-2009 |
| 20100208317 | ALL OPTICAL PROCESSING CIRCUIT FOR CONFLICT RESOLUTION AND SWITCH CONFIGURATION IN A 2X2 OPTICAL NODE - An optical processing circuit, such as a combinatorial network, comprises an arrangement of optical logic gates suitable for use in combination with a switched optical node of the kind having at least first and second input ports and two output ports, the node being configurable into either a cross or a bar configuration, and in which the optical processing circuit is arranged so as to receive at least three optical input signals which respectively comprise a packet identifier signal PIH which identifies whether or not a first input signal is present at the first input port of the switched optical node, the first input port being assigned a higher priority than the second input port, a first destination address AH indicating the output port of the switched optical node to which a first information carrying signal, received at the first input port, is intended to be passed, and a second destination address AL indicating the output port of the switched optical node to which a second information carrying signal, received at the second input port, is intended to be passed, and in which the processing circuit is configured to generate from these three optical input signals the following optical output signals: a contention resolution control (CRC) signal which has a first value if a routing conflict is present and a second if it is not; and a switch control generation (SCG) signal indicating whether the associated switched optical node is to be set in a cross or bar configuration. | 08-19-2010 |
| Patent application number | Description | Published |
|---|
| 20080247018 | Reconfigurable and Integrable Optical Logic Gate Based on a Single Soa - An optical logic gate ( | 10-09-2008 |
| 20090001963 | High Temporal Resolution Optical Sampler and Sampling Method - An optical sampler with high temporal resolution comprises a TOAD device ( | 01-01-2009 |
| 20090034970 | Optical Switch Controller - An optical switch controller controls an optical interconnection network that variably connects at least one input data channel to a plurality of outputs channels via at least one switching element. An address reader module has at least one semiconductor optical amplifier optically processes an optical signal. The address reader module obtains information by reading a data tag from the input data channel, and outputs an address control signal based on the information. The address control signal can be used to control switching elements in the optical interconnection network. | 02-05-2009 |
| 20090059331 | Optical Circuit for Comparing Two N-Bit Binary Words - An optical comparator circuit comprises a first stage comprising an optical gate which receives the signals applied to the two inputs and produces at its output an N bit signal with each bit being representative of the logical expression A XOR B for a respective pair of bits of the words A and B, a second stage which comprises an optical gate having at least two inputs, a first input being connected to the output of the first stage by an optical connection having a first time delay, and a second input being connected to the output of the first stage through (N−1) further optical connections, each further connection having a different associated time delay which is longer than the first time delay, the second stage providing at its output a signal comprising N bits, each bit corresponding to a respective bit of the signal output from the first stage at that time, and each bit having a first value if all of the inputs to the stage at that time are equal and a second value if and only if the first input differs in value from all of the second inputs, and a third stage which comprises an optical gate having two inputs, the first input being connected to the first input node of the comparator circuit and the second input being connected to the output of the second stage, the output of the third stage comprising an N-bit signal with each bit having a first value if the inputs at that time differ and a second value if the inputs at that time are the same, the presence of the second value in the output being indicative of word A being greater than word B. | 03-05-2009 |
| 20090060501 | All Optical Batcher Banyan Switch, Batcher Switch, Banyan Switch and Contention Manager - An all-optical contention manager includes at least two inputs and at least two outputs. The outputs are configured to output signals to a Banyan switch. The contention manager detects and resolves routing contentions between incoming optical signals prior to outputting the signals to the Banyan switch. The signals have tags that include routing information. A photonic comparator in the contention manager compares the tags of incoming optical signals in order to detect contention. | 03-05-2009 |
| 20090269070 | Multiplexer with Aptical Add/Drop - A method of extracting a predetermined channel from an OTDM signal includes the steps of combining at the inlet of an SOA the OTDM signal and an impulsive signal with impulses temporally synchronized with the channel to be extracted to produce in the SOA FWM, XGM and XPM effects which shift to a length c the channel chosen for extraction with c outside the length d of the OTDM signal with the other channels outlet from the SOA and filtering the SOA outlet to extract components with c d that represent respectively the desired channel and the cleaned OTDM signal. A multiplexer in accordance with the method includes an inlet ( | 10-29-2009 |
