LBRP2 User Guide

Last updated: November 16, 2018

Required materials

Quickstart

  1. Mount your Laser board on the Red Pitaya and connect the SMA cables.
  2. Insert your SD card in the Red Pitaya.
  3. Connect your Red Pitaya to either a router or a computer with an ethernet cable.
  4. Plug in the power supply connected to the PWR slot of the Red Pitaya.

Web interface

Open your internet browser and enter your Red Pitaya IP address in the url bar.

Python API

You can control the laser board programmatically with the Python API. You can find examples of Python scripts on GitHub.

Interface with the Red Pitaya

Koheron LBRP2 uses the Red Pitaya extension connectors E1 and E2 for power supply, slow monitoring and control. Modulation input is connected to the 125 MSps DAC via the SMA front connector. Detection output is connected to the 125 MSps ADCs via the SMA front connector.

LBRP dimensions and connectors

LBRP connectors

Digital interface

E1 connector

Pin Description Connected to
4 DIO0_N EEPROM (DO)
5 DIO1_P EEPROM (DI)
6 DIO1_N EEPROM (SK)
7 DIO2_P EEPROM (CS)
17 DIO7_P Laser enable
18 DIO7_N Reset overvoltage

Analog interface

E2 connector

Pin Description Connected to
13 Analog Input 0 Laser current monitor
15 Analog Input 2 Laser power monitor
20 Analog Output 3 Laser current bias


Note: The laser current bias is related to the analog output voltage $V_{\rm AO}$ by

$$ I_{\rm LD} \; \mathrm{(mA)} = 47.6 \times V_{\rm AO} \; \mathrm{(V)}. $$
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