Abstract: The invention comprises a multilevel optical signal system comprising two or more light source branches and an optical power-combiner, wherein each branch comprising a light source, an optical modulator and an electrical driver for the modulator, wherein each electrical driver is configured for being driven by electrical signals to drive the modulator to modulate the light generated by the light source into a corresponding 2-level data signal such that the respective 2-level data signals differs in power level.

Abstract: A TIA includes first and second input terminals for differentially receiving an input current signal, and first and second amplification circuits. The first amplification circuit includes a first Alternating-Current (AC) path and a first Direct-Current (DC) path that are configured to amplify in parallel respective first AC and DC components of the input current signal flowing via the first input terminal, and a first combiner configured to sum the amplified first AC and DC components. The second amplification circuit includes a second AC path and a second DC path that are configured to amplify in parallel respective second AC and DC components of the input current signal flowing via the second input terminal, and a second combiner configured to sum the amplified second AC and DC components. First and second output terminals are configured for outputting an output voltage signal formed between outputs of the first and second combiners.

Abstract: A modulator driver circuit for providing a drive voltage to an electro-absorption modulator, such a Franz-Keldysh modulator, or to a micro-ring modulator, and an optical transmitter including such driver circuit, where said driver circuit includes a differential amplifier and at least one differential branch of the differential amplifier being provided with a voltage offset. This provides for a bias voltage being adjustable within the driver circuit itself. Preferably, the differential amplifier is arranged for supplying drive voltage to two complementary driver outputs providing a reverse bias relative to the modulator. In one embodiment, the differential amplifier includes a cascode in the differential branch not being provided with the voltage offset.

Abstract: The invention comprises a multilevel optical signal system comprising two or more light source branches and an optical power-combiner, wherein each branch comprising a light source, an optical modulator and an electrical driver for the modulator, wherein each electrical driver is configured for being driven by electrical signals to drive the modulator to modulate the light generated by the light source into a corresponding 2-level data signalsuch that the respective 2-level data signals differs in power level.

Abstract: A modulator driver circuit for providing a drive voltage to an electro-absorption modulator, such a Franz-Keldysh modulator, or to a micro-ring modulator, and an optical transmitter comprising such driver circuit, where said driver circuit comprises a differential amplifier and at least one differential branch of the differential amplifier being provided with a voltage offset. This provide for a bias voltage being adjustable within the driver circuit itself. Preferably, said differential amplifier is arranged for supplying drive voltage to two complementary driver outputs providing a reverse bias relative to the modulator. In one embodiment, said differential amplifier comprises a cascode in the differential branch not being provided with the voltage offset.

Abstract: A method for optical transmission of high speed data and an optical receiver for receiving such high speed data is provided. The method includes transmitting an optical signal having a first logic-high and first logic-low defining a first modulation amplitude that is sub-band modulated with a toggling signal having a first toggling amplitude with a first modulation index, receiving the optical signal with an optical receiver circuit and converting the optical signal to an intermediate electrical signal, IES, having: a second logic-high and a second logic-low defining a second modulation amplitude, and a second toggling amplitude having a second modulation index, providing a decision threshold relative to the IES as a function of the second modulation amplitude, and adjusting the threshold by determining the second toggling amplitude and adjusting the threshold relative to the IES based on proportionality between the second toggling amplitude and the second modulation amplitude.z.

Abstract: The present invention relates to a flexible method of provide chips for optical interconnect with different number of channels.

Abstract: A method for optical transmission of high speed data and an optical receiver for receiving such high speed data is provided. The method includes transmitting an optical signal having a first logic-high and first logic-low defining a first modulation amplitude that is sub-band modulated with a toggling signal having a first toggling amplitude with a first modulation index, receiving the optical signal with an optical receiver circuit and converting the optical signal to an intermediate electrical signal, IES, having: a second logic-high and a second logic-low defining a second modulation amplitude, and a second toggling amplitude having a second modulation index, providing a decision threshold relative to the IES as a function of the second modulation amplitude, and adjusting the threshold by determining the second toggling amplitude and adjusting the threshold relative to the IES based on proportionality between the second toggling amplitude and the second modulation amplitude.z.

Abstract: A method for an optical transmitter, receiver or transceiver allowing determination of a signal property of a first binary signal such as the modulation amplitude. The method applies a reference stage which is modulated by the signal content of the first binary signal to allow the determination.

Abstract: A method and an optical receiver implementing this method suitable for robustly receiving unencoded optical data. The method sets the threshold for the receiver using values relating to the high and low values of a binary signal. However, for some data patterns these values may not be accurately determined, such as for extended periods of constant high or low values being transmitted. In this case the method, in one embodiment, assumes that the extinction ratio of the signal is substantially constant and is thereby able to track the threshold for the signal.

Abstract: A method for an optical transmitter, receiver or transceiver allowing determination of a signal property of a first binary signal such as the modulation amplitude. The method applies a reference stage which is modulated by the signal content of the first binary signal to allow the determination.

Abstract: The present invention relates to a flexible method of provide chips for optical interconnect with different number of channels.

Abstract: The invention relates to a method and an optical receiver implementing this method suitable for robustly receiving unencoded optical data. The method set the threshold for the receiver using values relating to the high and low values of a binary signal. However, for some data patterns these values may not be accurately determined, such as for extended periods of constant high or low values being transmitted. In this case the method, in one embodiment, assumes that the extinction ratio of the signal is substantially constant and is thereby able to track the threshold for the signal.

Abstract: An optical link for communicating a payload data stream between a near end transceiver and a far end transceiver via an optical communication channel, the near end transceiver including a near end receiver (near-Rx) and a near end transmitter (near-Tx) and the far end transceiver including a far end receiver (far-Rx) and a far end transmitter (far-Tx), wherein the far-TX is adapted to transmit a link data stream to the near-RX beside the payload data stream from the far end to the near end.

Abstract: According to embodiments of the present invention, an emitter follower-based or source follower-based driver is coupled to drive a silicon-based Mach-Zehnder interferometer optical modulator. In one embodiment, the emitter/source follower includes a pair of transistors that drive a differential electrical data signal to a pair of phase shifters in the optical modulator. In other embodiments, a pair of current source transistors provides an extra current for the differential electrical data signal.

Abstract: Briefly, a system that may facilitate system and line loop back diagnostic operations. In one possible implementation, a first transceiver may transmit test signals to a second transceiver. The second transceiver may include a transmitter with the capability to reduce jitter in received test signals prior to transmission of received test signals back to the first transceiver. The first transceiver may determine path integrity characteristics based on the test signals transmitted from the second transceiver.

Abstract: By application of a method and a circuit for retiming one or several digital data signal(s) (Din) each consisting of a number of successive bits, wherein the data signal is sampled by an internal clock signal (Ckint) generated from an external clock signal (Ckref), the internal clock signal (Ckint) is phase locked to the data signal (Din) so that the latter is sampled approximately in the centre of every bit. By generating the internal clock signal from the external clock signal, and at the same time phase locking it to the data signal, the internal clock signal will automatically adjust itself so that the data signal is sampled at the appropriate point in time, i.e. in the centre of the bit period. As a result, there are no strict requirements as to the synchronisation between the data signal and the clock signal, and an individual adjustment of the synchronisation in preceding circuits is thus avoided.