14 results about "Coarse wavelength division multiplexing" patented technology

The invention provides a distributed feedback laser with a double-layer grating structure, and relates to the technical field of lasers, the laser forms an InGaAlAs multi-quantum well active region, an upper sampling grating layer and a lower phase shift grating layer on an n-type InP substrate in sequence, the upper grating layer is designed based on a reconstruction equivalent chirp technology, and the lower phase shift grating layer is designed based on a reconstruction equivalent chirp technology. Two sections of asymmetric modulation areas with sampling periods linearly gradually changing in opposite directions are arranged in the axial direction of the resonant cavity, and the lower grating layer is a quarter-wave phase shift grating matched with the period of the upper seed grating. Through the synergistic effect of equivalent phase modulation and phase shift generated by the double-layer grating, the photon density distribution in the cavity can be improved, the longitudinal space hole burning effect can be weakened, the sensitivity to end face phase fluctuation can be reduced, high single-mode power and large modulation bandwidth can be realized in a wide temperature range, and the double-layer grating is suitable for a high-speed optical communication and coarse wavelength division multiplexing transmission system.

A system can include a unit cell of a ring modulator of a coarse wavelength division multiplexing (CWDM) optical link. The unit cell includes a ring resonator including a ring waveguide configured to receive, via a first bus waveguide, an optical signal, and modulate the optical signal to generate a modulated optical signal. The unit cell further includes a multiplexer, disposed between the first bus waveguide and a second bus waveguide, configured to filter the modulated optical signal.

This invention discloses a digital holographic 3D reconstruction system and method based on a single-cavity dual-optical comb, belonging to the field of digital holographic 3D measurement technology. The invention includes: a single-cavity dual-optical comb, a coarse wavelength division multiplexer, a first fiber amplifier, a second fiber amplifier, a first fiber filter, a second fiber filter, a first fiber beam expander, a concave mirror, a second fiber beam expander, a beam splitter, an image sensor, and a computer. The single-cavity dual-optical comb emits two pulses, which are split, amplified, and filtered. The measurement light and the reference light produce interference fringes, forming a hologram. This invention uses a single-cavity dual-optical comb as a light source to achieve the separation of the zero-order image, twin image, and target re-phenomenon in coaxial holography, improving the quality of holographic imaging and facilitating engineering implementation. Based on multi-wavelength heterodyne technology, combined with the wide spectral bandwidth and high temporal coherence of the optical comb, this invention suppresses the influence of noise, enabling the measurement of large-size objects and expanding the application scenarios of digital holography.

The invention discloses a polarization-insensitive silicon-based flat-top filter for a coarse wavelength division multiplexing system. The output end of the mode demultiplexer is connected with the input ends of the two input connection S-shaped waveguides through the heat insulation 1 * 2 beam splitter, and the output ends of the two input connection S-shaped waveguides are connected with the two input ends of the Bragg grating through respective input conical waveguides. The two output ends of the Bragg grating are respectively connected with the two input ends of the output connection S-bend waveguide through respective output conical waveguides, and the two output ends of the output connection S-bend waveguide are connected with the output port through the heat insulation 2 * 1 beam combiner. The problem of polarization sensitivity of an existing CWDM filter on a silicon substrate is solved, further simplification of an on-chip structure is facilitated, the comprehensive performance of a system on a silicon substrate is improved, and wide application prospects are achieved.

This application relates to the field of optical communication technology, specifically to a dense wavelength division multiplexing (DWDM) structure and optical chip, aiming to solve the technical problem of how to achieve a large-channel, low-crosstalk DWDM structure based on multiple coarse wavelength division multiplexers. To this end, the DWDM structure of this application includes: multiple sets of one-to-one corresponding micro-ring resonators and coarse wavelength division multiplexers, where the resonant wavelength of the micro-ring resonator includes the output wavelength of its corresponding coarse wavelength division multiplexer. Through the interleaving design of the output wavelengths of adjacent coarse wavelength division multiplexers, the channel spacing of the reduced coarse wavelength division multiplexers is achieved. Through the wavelength selection of the micro-ring resonators and the matching design between micro-ring resonators with different center resonant wavelengths and each coarse wavelength division multiplexer, the severe channel crosstalk problem caused by simply interleaving the coarse wavelength division multiplexers is reduced, thus forming a new large-channel, low-crosstalk DWDM structure, solving the problem of severe crosstalk in conventional large-channel DWDM designs.

A Coarse Wavelength Division Multiplexing filter system and methods based on an angled bent multimode interferometer. The system includes one input port; a plurality of output ports; and a bent multimode waveguide connecting the input port and the plurality of output ports, having an inner radius of R mmi; wherein light incident to the input port is demultiplexed into a plurality of wavelength channels(ch1, ch2, ch3, ch4). The inner radius R mmi and / or an excited mode order range of the CWDM filter system can be optimized to form a high-quality self-image at the output ports. An angle between a middle portion of respective input port and the output portions and tangent of an inner arc of the bent multimode waveguide is defined as θ IO; the input port and the output ports each has a width W IO. θ IO and W IO can be optimized for sufficient distances between adjacent output ports for channel spacing such that a minimal crosstalk between output wavelength channels is obtained.

The invention provides an on-chip integrated interconnection structure which comprises a calculation module integrated on the same substrate, a plurality of photoelectric co-packaging modules and coarse wavelength division multiplexers, the photoelectric co-packaging modules and the coarse wavelength division multiplexers are stacked around the calculation module, and the calculation module and the photoelectric co-packaging modules are electrically interconnected through a rewiring layer. And the photoelectric co-packaging module and the coarse wavelength division multiplexer realize optical interconnection through a polymer waveguide. According to the on-chip integrated interconnection structure provided by the invention, the photoelectric co-packaging module, the coarse wavelength division multiplexer and the calculation module are interconnected and packaged and integrated together, so that an optical in-out integrated optical communication module is realized; moreover, the photoelectric co-packaging module and the coarse wavelength division multiplexer are connected through the polymer waveguide, the problem that the packaging density is limited due to the size limitation of existing optical fiber interconnection is solved through the small size of the polymer waveguide, and the packaging density is effectively improved.

The invention discloses a compact reverse design coarse wavelength division multiplexer based on a lead zirconate titanate film and a design method, and belongs to the technical field of integrated photonic devices.The multiplexer comprises an input straight waveguide, a dense topological optimization area and a plurality of output waveguides, wherein the dense topological optimization region is subjected to gray optimization and binarization processing by adopting a reverse design method to form a binary material distribution structure of PZT and air, and a multi-wavelength demultiplexing function is realized. The device is compact in size, the topological region is only 22 [mu] m * 8 [mu] m, the insertion loss of each channel in a target communication band is lower than 0.5 dB, the inter-channel crosstalk is lower than-15 dB, and the device is suitable for a high-density photon integrated system.

Embodiments of a structure for polarization independent coarse wavelength division demultiplexing are disclosed. The structure includes a polarization beam splitter-rotator (PSR) that receives a dual polarization mode multi-wavelength optical signal and outputs a single polarization mode multi-wavelength optical signal. The structure includes a wavelength division demultiplexer (WDD) and a thermo-optical phase shifter (TOPS) coupled to the PSR and coupled to or integrated into an input section of the WDD. The structure includes at least one photodetector and a thermal control system (TCS). The photodetector is coupled to an unused end of a waveguide in the TOPS or WDD (depending on the embodiment). The TCS monitors the output current from the photodetector and sets a heating voltage applied to a heating element in the TOPS based thereon to ensure that a single wavelength optical signal output from the output section of the WDD is at a desired wavelength and power level.

Optical devices for coarse wavelength division multiplexing bands and systems and methods for achieving modest bandwidth expansion (i.e., higher data transmission rates) for coarse wavelength division multiplexing (CWDM) and CWDM-4 technology are provided. Examples leverage a band architecture built around the CWDM wavelengths. This band architecture adds additional wavelength transmission lanes (which can equate to faster data transmission rates) while maintaining backward compatibility with existing CWDM / CWDM-4 technology. Examples can include band devices (e.g., band light sources, band transmitters, band receivers, band transceivers, etc.) designed to operate in one or more CWDM bands while maintaining backward compatibility with existing CWDM-4 technology.

The application discloses a polarization-insensitive silicon-based flat-top filter for a coarse wavelength division multiplexing system. The output end of a mode demultiplexer is connected with two input connection S-bend waveguides through an adiabatic 1*2 beam splitter. The output ends of the two input connection S-bend waveguides are respectively connected with two input ends of a Bragg grating through one input tapered waveguide respectively. The two output ends of the Bragg grating are respectively connected with two input ends of an output connection S-bend waveguide through one output tapered waveguide respectively. The two output ends of the output connection S-bend waveguide are connected with an output port through an adiabatic 2*1 beam combiner. The application solves the polarization sensitivity problem of the existing CWDM filter on a silicon substrate, is helpful to further simplify the structure on the chip, improve the comprehensive performance of the system on the silicon substrate, and has a wide application prospect.

Disclosed are embodiments of a structure for polarization-independent coarse wavelength division demultiplexing. The structure includes a polarization splitter-rotator (PSR), which receives a dual polarization mode multi-wavelength optical signal and outputs a single polarization mode multi-wavelength optical signal. The structure includes a wavelength division demultiplexer (WDD) and a thermo-optic phase-shifter (TOPS), which is coupled to the PSR and either coupled to the input section of the WDD or integrated into the input section of the WDD. The structure includes at least one photodetector and a thermal control system (TCS). The photodetector is coupled to an unused end of a waveguide in either the TOPS or WDD (depending on the embodiment). The TCS monitors output current from the photodetector, and based thereon, sets heating voltage(s) applied to heating element(s) in the TOPS, ensuring that single wavelength optical signals output from output sections of the WDD are at desired wavelengths and power levels.

The invention discloses a quantum-enhanced phase sensing device and method, and the device comprises an injection light generation assembly, the injection light generation assembly outputs first pump light, second pump light and seed light, the first pump light, the second pump light and the seed light are simultaneously injected into a dispersion-shifted optical fiber through a second wavelength division multiplexer, the output end of the dispersion-shifted optical fiber is connected to a coarse wavelength division multiplexer, and the output end of the coarse wavelength division multiplexer is connected to a second wavelength division multiplexer. Signal light output by the coarse wavelength division multiplexer enters a photoelectric detector, the output end of the photoelectric detector is connected to a splitter, one output end of the splitter is connected to a phase-locked component, and the other output end of the splitter is connected to an electronic spectrum analyzer; the method comprises the following steps: generating first pump light, second pump light and seed light, and matching the optical paths of the three light beams; encoding a phase signal in a seed optical path of the injection light generating component; locking the phase difference between the seed light and the first pump light and the phase difference between the seed light and the second pump light by using a phase locking assembly; and measuring a signal through an electronic spectrum analyzer and carrying out signal-to-noise ratio analysis. Phase sensing of which the signal-to-noise ratio exceeds that of a classic interferometer can be realized.

The utility model discloses a two-in-one multipath compact coarse wavelength division multiplexer, which relates to the technical field of coarse wavelength division multiplexers and comprises a transmission assembly, the transmission assembly is arranged in a wavelength division multiplexer body and comprises a first fixing rod fixedly connected onto the wavelength division multiplexer body, a lower pressing plate is slidably connected onto the transmission assembly, and the lower pressing plate is fixedly connected onto the transmission assembly. A first fixing frame is fixedly connected to the lower pressing plate, a first sliding shaft is slidably connected to the first fixing frame, a second fixing rod is fixedly connected to the first sliding shaft, a connecting rod is fixedly connected to the second fixing rod, the connecting rod is slidably connected to the wavelength division multiplexer body, and a first limiting block is fixedly connected to the second fixing rod; the wavelength division multiplexer is simple in structure and convenient to mount and dismount, the connecting frame is fixed on a machine only through bolts, when the wavelength division multiplexer body needs to be mounted or dismounted subsequently, only the first limiting block needs to be controlled to slide out of the connecting frame or be clamped in the connecting frame, operation is extremely simple and convenient, and the problem that screws need to be screwed down frequently during mounting and dismounting in the prior art is solved.