  Photonic crystal (PC) coupled cavity waveguides (CCWs) with
\textit{completely separated eigenfrequencies} (or supermodes) are
investigated. Using a coupled mode theory, the properties of the supermodes,
such as the electric field profiles, the eigenfrequencies (including the
central frequencies and corresponding linewidths), and the quality factors (Qs)
are expressed in very simple formulas, and these results agree well with those
of ``exact'' numerical method. We also discuss the great differences between
the supermodes and \textit{continuous modes}, which are described by tight
binding (TB) theory. Then, the properties of supermodes are used to investigate
their potential applications in multichannel (covering the whole C-band)
bistable switchings, and bistable loops are obtained numerically. We also
predict and verify that all the thresholds are uniform inherently.
