39 results about "Ring modulation" patented technology

An on-chip Josephson parametric converter is provided. The on-chip Josephson parametric converter includes a Josephson ring modulator. The on-chip Josephson parametric converter further includes a lossless power divider, coupled to the Josephson ring modulator, having a single input port and two output ports for receiving a pump drive signal via the single input port, splitting the pump drive signal symmetrically into two signals that are equal in amplitude and phase, and outputting each of the two signals from a respective one of the two output ports. The pump drive signal excites a common mode of the on-chip Josephson parametric converter.

A system that facilitates optical multiplexing and demultiplexing. The system includes an optical transmitter which is structured in the following way. A wavelength-splitting mechanism is coupled to the optical transmitter, which separates the wavelengths of light onto an array of input-optical-waveguide busses within the optical transmitter. An array of ring modulators within the optical transmitter is coupled to each optical-waveguide bus, wherein the input-end of a given ring modulator is coupled to a corresponding input-optical-waveguide bus. Output-optical-waveguide busses within the optical transmitter are coupled to the array of ring modulators, wherein the output-end of each ring modulator is coupled to a corresponding output-optical-waveguide bus. When a modulation signal is applied to a given ring modulator within the array of ring modulators, a specific wavelength of light is directed to the corresponding output-optical-waveguide bus.

A dual-ring-modulated laser includes a gain medium having a reflective end coupled to a gain-medium reflector and an output end coupled to a reflector circuit to form a lasing cavity. This reflector circuit comprises: a first ring modulator; a second ring modulator; and a shared waveguide that optically couples the first and second ring modulators. The first and second ring modulators have resonance peaks, which are tuned to have an alignment separation from each other. During operation, the first and second ring modulators are driven in opposing directions based on the same electrical input signal, so the resonance peaks of the first and second ring modulators shift wavelengths in the opposing directions during modulation. The modulation shift for each of the resonance peaks equals the alignment separation, so the resonance peaks interchange positions during modulation to cancel out reflectivity changes in the lasing cavity caused by the modulation.

Methods and systems for optoelectronics transceivers integrated on a CMOS chip are disclosed and may include receiving optical signals from optical fibers via grating couplers on a top surface of a CMOS chip, which may include a guard ring. Photodetectors may be integrated in the CMOS chip. A CW optical signal may be received from a laser source via grating couplers, and may be modulated using optical modulators, which may be Mach-Zehnder and/or ring modulators. Circuitry in the CMOS chip may drive the optical modulators. The modulated optical signal may be communicated out of the top surface of the CMOS chip into optical fibers via grating couplers. The received optical signals may be communicated between devices via waveguides. The photodetectors may include germanium waveguide photodiodes, avalanche photodiodes, and/or heterojunction diodes. The CW optical signal may be generated using an edge-emitting and/or a vertical-cavity surface emitting semiconductor laser.

The invention discloses an optical frequency hopping system based on an optical circulator and a transmitter. The optical frequency hopping system includes: an annular modulation unit, whereinthe annular modulation unit comprises a plurality of optical circulators; the first port of each optical circulator receives different optical carriers; a second port of each optical circulator is connected with an optical coupler, each optical coupler is connected with a phase modulator and is combined with frequency hopping coding in a pseudo-random code generator to realize coding modulation of an optical carrier signal, and a third port of each optical circulator respectively outputs the coded and modulated optical carrier signal; a transmitter which is internally provided with the annular modulation unit and is used for transmitting the optical carrier signal encrypted by the annular modulation unit; a receiver which is used for receiving the encrypted optical carrier signal and decrypting the encrypted optical carrier signal through frequency hopping coding; and an optical fiber which is used for realizing carrier communication between the transmitter and the receiver. According to the invention, high-speed optical frequency hopping coding can be realized, a flexible and simple unit structure is provided, expansion to a multi-channel optical frequency hopping system is facilitated, and a communication system with higher confidentiality is provided.

Methods and systems for split voltage domain transmitter circuits are disclosed and may include amplifying a received signal in a plurality of partial voltage domains. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. A sum of the plurality of partial domains may be equal to a supply voltage of the integrated circuit. A series of diodes may be driven in differential mode via the amplified signals. An optical signal may be modulated via the diodes, which may be integrated in a Mach-Zehnder or a ring modulator. The amplified signals may be communicated to the diodes, connected in a distributed configuration, via even-mode coupled transmission lines. The partial voltage domains may be generated via stacked source follower or emitter follower circuits. The voltage domain boundary value may be at one half the supply voltage due to symmetric stacked circuits.

Ring modulators based on interdigitated junctions may be driven in full or partial standing wave mode and, active regions (providing the modulation) and light-absorptive regions (e.g. providing electrical conduction) are placed in a pattern inside a resonant cavity in order to match the maxima and minima of the optical field, respectively. The pattern may be periodic to match the periodicity of a typical electromagnetic field which is periodic with the wavelength. It may also be aperiodic in the case that the cross-section or materials are engineered along the direction of propagation such that the propagation constant (and thus wavelength, i.e. optical wave “local periodicity”) change along the propagation direction.

This optical semiconductor element is provided with: a ring modulator; and a light absorbing material (9), which is provided at a position separated from a path of light to be modulated, said path guiding waves in the ring modulator, absorbs light leaked from a ring waveguide (3) of the ring modulator, and increases a temperature of the ring waveguide (3).

The invention discloses a micro-ring wavelength control method, a system, a device and a computer readable storage medium. The method comprises the steps that a first monitoring signal of the input end of a micro-ring modulation circuit and a second monitoring signal of the output end of the micro-ring modulation circuit are obtained; performing first preset processing on the first monitoring signal to obtain a first electric signal; performing second preset processing on the second monitoring signal to obtain a second electric signal and a third electric signal; judging whether the micro-ring works in a preset state according to the first electric signal and the second electric signal to obtain a judgment result; under the condition that the judgment result shows that the micro-ring does not work in the preset state, determining a first control signal for adjusting the working wavelength of the micro-ring and a preset signal for realizing the working wavelength compensation of the micro-ring based on the first electric signal and the second electric signal; determining a second control signal for adjusting the working wavelength of the micro-ring according to the third electric signal and a preset signal; and controlling the resonant wavelength of the micro-ring based on the first control signal and the second control signal so as to compensate the drift of the working wavelength of the micro-ring.

An optical transmitter includes: a set of reflective silicon optical amplifiers (RSOAs), a set of ring modulators, a shared broadband reflector, a set of intermediate waveguides, and a shared waveguide. Each intermediate waveguide channels light from an RSOA in proximity to an associated ring modulator to cause optically coupled light to circulate in the associated ring modulator. The shared waveguide is coupled to the shared broadband reflector, and passes in proximity to the set of ring modulators, so that light circulating in each ring modulator causes optically coupled light to flow in the shared optical waveguide. During operation, each RSOA forms a lasing cavity with the shared broadband reflector, wherein each lasing cavity has a different wavelength, which is determined by a resonance of the associated ring modulator. The different wavelengths are combined in the shared waveguide to produce a combined output.