Abstract
A simple low-cost, synchronized, in-band, and stable signaling insertion
and detection scheme is proposed for the reconfigurable wavelength division
multiplexing and orthogonal frequency division multiplexing (WDM-OFDM) access
network. The low-frequency signaling is generated with the optical OFDM signal.
Such signaling data can be simply detected by using a low-speed photon diode
cascaded with an electrical low-pass filter. The low-frequency insertion and
detection (LFID) induced impairments are analyzed theoretically and verified
through experiments. The principle to design LFID is derived and the optimization
of such a scheme is discussed. The LFID scheme is demonstrated for a reconfigurable
WDM-OFDM optical network with 15 Gb/s per wavelength. The power penalty of
signaling after 12.5 and 100 km is 0.35 and 0.85 dB at bit error rate (BER)
of 3.44 × 10<sup>-8</sup>, respectively. The ON–OFF keying insertion induced power
penalty for BER at 2.4
× 10<sup>-4</sup> is 0.9 dB for back-to-back, 1.1 dB for 12.5
km, 1.5 dB for 100 km, respectively. There is only 0.6 dB additional penalty
caused by the transmission fiber of 100 km, which demonstrates that this signaling
scheme does not increase system penalty considerably.
© 2012 IEEE
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