Raw data for calibration of wavelength-to-time mapping (Fig. 3)

Calibration for wavelength-to-time mapping experiment.

In order to calibrate the wavelength to time mapping (WTM), the tunable Fabry-PÈrot filter was tuned to different wavelengths in the 500nm to 600m region. For each position of the filter a spectrum with a conventional spectrometer (USB2000 - Ocean Optics) and the 290m long multicore fibre with the photonics lantern attached to it were recorded (USB2000_calibration_(wavelength)).

The arrival times for different wavelengths for each core-pixel combination was recorded (TCSPC_Calibration_(wavelength)) and a 4th order polynomial was fitted to the data. The equations of these fits was used to convert the arrival times into wavelengths for the broadband WTM measurement in the 500nm-600nm region.

The arrival times of different wavelengths for the centre core, the core with highest and lowest group velocities is given in Arrival time(fig 3b).

For all TCSPC data files, the file consists of a 1024 x 1024 matrix with columns representing pixel number and row representing time bin. To convert time bin into time(s), multiply bin number with the resolution, 53ps e.g. bin number 100 = 100x53e-12s.

To process the TCSPC data, all the hot pixels (TCSPC_Hot pixels) should be set to 0.