Waveguide optical coding device for optical ADC

Abstract

Waveguide optical coding device for optical ADC belongs to the optical technical field and relates to the optical signal treatment and integrated optical device. The device is composed of 2-1 longitudinal waveguides and N horizontal waveguides integrated by one chip, the longitudinal waveguides and the horizontal waveguides are connected by waveguide connecting structural units A, B or C, or connected in a right-angled intersection manner or not connected. The invention is substantially based on an optical total internal reflection principle and designs different waveguide connecting structural units for realizing optical transmission and optical power budget, and the spatial positions of the waveguide connecting structural units on the coder correspond to the binary coding thereof so as to accomplish the coding process in ADC. The waveguide optical coding device for optical ADC provided in the invention has the advantages that the coding speed is quick, the performance is stable and reliable, the design is simple, the manufacturing difficulty is low, the cost is low, the volume is small and the like; and the coder and the waveguide array grating can be integrated. Thus, the invention is in favor of improving the stability and reliability of the system and reducing the cost.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to optical signal processing and integrated optical devices, in particular to a device for automatically and real-time encoding of optical signals after wavelength quantization in an optical analog-to-digital converter (ADC). Background technique [0002] Usually, the signals in nature exist in continuous form (that is, analog signals). In order to facilitate the storage, processing and transmission of signals, analog signals must be converted into digital signals. The core device is an analog-to-digital converter based on binary technology. (ADC, Analog-to-digital converter), it is an irreplaceable bridge and link connecting the analog world with the digital world. [0003] The sampling rate and conversion accuracy of the ADC are key technical indicators to measure the performance of the ADC. With the development of science and technology, the digital system puts forward higher and...

AI Technical Summary

Problems solved by technology

The existing optical coding method mostly adopts the coding method of optical fiber interconnection, which requires a fiber coupler with precise control of the beam splitting ratio, and the number is large, and the cost is high; There are many coupling ports, which is not conducive to packaging, and the performance stability and reliability of the device are poor

The existing optical encoding method also uses a method based on a rectangular function filter, but this method requires a high-precision rectangular function filter, and as the number of encoding bits increases, it requires that the bandwidth of the rectangular filter decreases geometrically. The production of this filter has the disadvantages of difficulty and high cost

[0007] It is worth mentioning that there have been some very novel quantization and encoding methods for all-optical ADCs reported recently. For example, Sharkway et al. in the United States proposed a method of using planar photonic crystals to realize quantization and encoding of all-optical ADCs, and completed the 2bits all-optical ADC. Experiments have shown that the ADC has a compact structure and is easy to integrate with other devices. However, since the ADC is composed of a self-guided photonic crystal, it is sensitive to the polarization state of the signal light and can only be used in a very small range. All-optical analog-to-digital conversion of optical analog signals on a narrow bandwidth; Belarusian Igor A.Goncharenko et al. proposed an optical quantization encoding method based on a microring resonator. This method controls the refractive index of the microring through an analog light wave signal, thereby To achieve tuning filtering, different output wavelengths represent its quantization code, they also gave the corresponding simulation results, so far no experimental results have been reported

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