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<N>-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...

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Problems solved by technology

[0007] It is worth mentioning that recently there are some very novel quantization coding methods reported for all-optical ADCs. Optical ADC quantization encoding method, and completed the experimental verification of 2bits all-optical ADC, its ADC structure is compact, easy to integrate with other devices, but since the ADC is composed of self-guided photonic crystals, it is The polarization state of signal light is sensitive, and it can only perform all-optical analog-to-digital conversion on optical analog signals in a very narrow bandwidth; Belarusian Igor A.Goncharenko et al. proposed an optical quantization coding method based on a microring resonator, This method is to control the refractive index of the microring by simulating the light wave signal, so as to realize the tuning filter, and the different output wavelengths represent its quantization code. They also gave the corresponding simulation results, but there are still no experimental results reported so far.

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