This data is being provided to be used in the context of the SIEF project "Big Data Knowledge Discovery"

Any use of this data should cite the following reference:
J. P. Toomey and D. M. Kane, "Mapping the dynamic complexity of a semiconductor laser with optical feedback using permutation entropy," 
Optics Express 22 (2), 1713-1725 (2014).

Source:
Dr Joshua P Toomey
MQ Photonics Research Centre
Dept of Physics and Astronomy
Macquarie University
josh.toomey@mq.edu.au

Prof Deborah M Kane
MQ Photonics Research Centre
Dept of Physics and Astronomy
Macquarie University
deb.kane@mq.edu.au

Data Set Information:
This data set was recorded from an experimental semiconductor laser subject to optical feedback on 13/08/12.
Laser wavelength ~ 830nm. External cavity round trip time 4.5ns.

During the experiment, 2 system parameters were varied: the optical feedback level and laser injection current.
- Optical feedback was varied by changing the RF power to an acousto-optic modulator (AOM) which varies the amount of laser power 
  transmitted in the 0th order beam. A voltage between 0V-1V corresponds to maximum transmission (0V) and minimum transmission (1V).
  The actual power transmitted by the AOM is not a linear relationship with voltage. Relative feedback level can be approximated from the 
  reduction in laser threshold.
- Laser injection is controlled by directly varying the current supply to the device (Profile ITC510 Laser Diode Combi-controller). Laser 
  was held at a constant 25C.

The TimeSeries folder contains 88,101 output power time series recorded from the laser using a fast photodiode (Discovery 
Semiconductors DCS30S 22GHz) and 4GHz realtime oscilloscope (Agilent 54854A) for different settings of:
- Injection (251 values = 45mA to 70mA in 0.1mA steps) 
- Feedback (351 values from 0.45V to 0.8V in 0.001V steps)

The filenames consist of a FB and INJ index which indicate the associated feedback and injection level
e.g.  	FB_000_INJ_000.csv   =   feedback = 0.45V, injection = 45mA
	FB_350_INJ_250.csv   =   feedback = 0.8 V, injection = 70mA

Each file consist of a single column of amplitude values measured as the voltage across the 50ohm oscilloscope input.
Time series were sampled at 20GSamples/s (50ps per data point) and contain 20,000pts for a total record length of 1microsecond.