Patent ID: 7274872
Filing Date: 2007-09-25
Classification: H04B

Abstract:
1. An apparatus for processing a supervisory signal for optical network applications, the apparatus comprising: a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal; an electrical-to-optical conversion system configured to receive the second supervisory signal and a first data signal and output a first optical signal; an optical-to-electrical conversion system configured to receive the first optical signal and output a first electrical signal and a second data signal; a subcarrier reception system configured to receive the first electrical signal and output a third supervisory signal; wherein the second supervisory signal is associated with a first subcarrier frequency; wherein the first data signal is associated with a first data bandwidth, the first data bandwidth including a first data frequency, at the first data frequency a power density of the first data signal substantially equal to zero; wherein a ratio of the first subcarrier frequency to the first data frequency ranges from 0.8 to 1; wherein the first optical signal is associated with a perturbation to the first data signal, the perturbation being smaller than or equal to 1 dB; wherein the first optical signal is associated with a signal-to-noise ratio for the second supervisory signal, the signal-to-noise ratio for the second supervisory signal being larger than or equal to 20 dB; wherein the first supervisory signal is associated with a first subcarrier data rate larger than 1 Mbps.