Abstract
We propose and demonstrate a novel colorless optical transmitter based
on all-optical wavelength conversion using a reflective semiconductor optical
amplifier (RSOA) for upstream transmission in wavelength-division-multiplexed
passive optical networks. The proposed colorless optical transmitter for the
optical network unit is composed of an electro-absorption modulated laser
(EML), an optical coupler, and an RSOA. Through cross-gain modulation in the
RSOA, the upstream data from the EML pump light are imposed onto a continuous-wave
probe light provided from the central office (CO). An optical delay interferometer
at the CO tailors the chirp of the upstream signal to improve the bandwidth
of the system and dispersion tolerance. The proposed upstream optical transmitter
is based on the fast gain recovery of the RSOA governed by carrier-carrier
scattering and carrier-phonon interactions. Thus, it can potentially operate
at > 10 Gb/s.
Two separate wavelength bands are allocated, one for the pump signals and
the other for the probe signals. Therefore, the proposed transmitter operates
in a colorless manner since the EML can have any arbitrary wavelength within
the pump band. We demonstrate the transmission of a 10.7-Gb/s upstream signal
generated by the proposed scheme in a single-fiber loopback-configured network.
The conditions for colorless operation of the proposed transmitter are investigated
through experiment.
© 2013 IEEE
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