Characterization of Fiber Bragg Gratings for Dispersion Compensation

1
Characterization of Fiber Bragg Gratings for
Dispersion Compensation
http//paginas.fe.up.pt/ee99113/
L. M. Ramos 1,2, R. P. Ramos 1,2, H. M. Salgado
1,2 1 INESC Porto - Unidade de Optoelectrónica e
Sistemas Electrónicos , 4169-007 Porto,
Portugal 2 Faculdade de Engenharia da
Universidade do Porto, 4200-465 Porto, Portugal
MEASUREMENT SETUP

• Network Analyzer operation
• Continuous Wave (CW) mode
• Control of sweep time
• Control of number of points

Fig. 2 Setup for measurement of amplitude and
group delay, with the Phase Shift method.
DEVELOPED SOFTWARE
DISPERSION COMPENSATION
Fig. 1 Dispersion compensation using a chirped
Fiber Bragg Grating.
Fiber Bragg Gratings are passive components that
work as optical filters. Their singular
characteristic makes them useful for dispersion
compensation. Underlying intramodal dispersion is
the broadening of the pulse. A chirped Bragg
grating introduces different delays at different
frequencies, compressing the pulse.
Fig. 4 Measurement with real time data
presentation.
Fig. 3 Software to control the system, and data
acquisition.
ADDITIONAL WORK
Fig. 7 Fiber with two gratings written.
Fig. 8 High resolution characterization for the
second grating.
Fig. 8 Generic software for data acquisition
from the Network Analyzer.
CONCLUSIONS
A measurement setup was implemented for
characterization of the amplitude and group delay
parameters of Fiber Bragg Gratings. Efficient
control of the setup with a user-friendly
interface was achieved. Characterization of Fiber
Bragg Gratings is carried out with
high-resolution and fast processing.