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Optical Signal Processing  Platform

Converting optical signals into analog and digital electrical signals, and performing further signal processing are important aspects of research and product development, unfortunately, these tasks are cumbersome and time consuming, requiring many years experience to maser. Consequently many optics scientists, engineers and students are less familiar with.  Specifically, these tasks include  a) converting optical signal to analog electrical signal using a photodiode (PD) and transimpedance amplifier (TIA); b) digitizing the analog signal using analog to digital converter (ADC); c) maximizing signal to noise ratio (SNR) by amplifier gain control. d) real-time digital signal processing (DSP), such as signal filtering, calibration and parameter calculation; e) performing feedback control; f) storing and reading calibration data; g) converting the digital data to physical quantities under test; h) data storage and display. 

CUBE-PD100 is a compact module specially designed to relieve the pain of the electronics-related tasks from the optics professionals in their daily work so that they can concentrate on solving real scientific problems. This miniature optical test and control platform equips with 1) four InGaAs low-noise photodetectors; 2) ultra-low noise and low drift TIAs with bandwidths up to 1MHz and three-step TIA gain controls for each PD; 3) four-channel simultaneous 12-bit analog to digital converters (ADC) with sampling rates up to 2.5 Mbps, a hardware oversampling function for achieving for 16-bit resolution, and 6-bit gain control; 4) 256k-bit nonvolatile memory to store setting and calibration data; 5)  large SRAM memory to store 40k samples; 6) mathematic accelerators for float-point calculating and real-time digital filtering; 7) two DAC outputs and two general-purpose I/Os to generate analog feedback-control signals and digital synchronizing signals; 8) firmware for reconfiguring the sampling clock, the synchronization clock and the ADC via remote command; and finally 9) graphic display of data and setting information.  

  • 4 ultra-low noise and drift photoreceivers with up to 1MHz Analog bandwidth

  • Up to 4-channel ADCs of simultaneously sampling  Up to 2.5MHz sampling rate

  • High dynamic range dBm ~ -80dBm

  • Customized firmware available

  • Reconfigurable hardware setting

  • Cascadable to multiple modules

  • On-board memory for storing user’s calibration data

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