Abstract
Flexible polymer waveguide with a Bragg reflection grating is incorporated
to form an external cavity laser with a wide tuning range, and it is evaluated
as a tunable light source for wavelength division multiplexing optical communication
systems. The highly elastic property of polymer materials makes them suitable
for producing a tunable Bragg reflector controlled by an imposed strain. The
flexible tunable Bragg reflector is installed on a compact moving stage 6
connected to a piezoelectric motor. By applying a total strain of 60680 με (6.07%),
wavelength tuning of 82 nm is achieved with a side-mode suppression
ratio of 43 dB and a linewidth less than 0.1 nm. The tunable laser controlled
by a microactuator exhibits long-term stability with a wavelength fluctuation
of less than 0.1 nm. In the optical transmission experiment, various wavelengths
are used to transmit the 2.5 Gb/s signal over 50 km, excellent performance
was observed with a power penalty of 1 dB compared to the DFB laser.
© 2013 IEEE
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