Abstract
All-optical format conversion is a key function in providing flexible management
and interface for optical networks with different formats. In this paper, we propose and
demonstrate multichannel mutual format conversions between the nonreturn-to-zero
quadrature phase-shift keying (NRZ-QPSK) and the return-to-zero QPSK (RZ-QPSK) signals
using a single semiconductor optical amplifier and/or a delay interferometer (DI). The
conversion from the NRZ-QPSK to RZ-QPSK is based on the cross phase modulation (XPM)
effect, which is introduced by a synchronous optical clock signal with high input power,
and subsequent detuned filtering. The amplitude of the NRZ-QPSK signal is converted to
the RZ-QPSK signal with identical phase shift onto every input bit by the XPM effect.
The conversion from the RZ-QPSK to NRZ-QPSK is based on the constructive interference in
a single DI with a half-bit delay. The principle for the mutual conversions is analyzed
theoretically, and simulations validate the feasibility of the proposed schemes.
Parallel 4 channels format conversions between the NRZ-QPSK and the RZ-QPSK signals are
experimentally achieved well with small Q penalty less than 2 dB.
© 2012 IEEE
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