Transmission Performance Analysis of WDM Radio over Fiber Technology for Next Generation Long-Haul Optical Networks

Figure 7

Optical spectrum at the output of fiber when the channel spacing is set at (a) 0.1 nm and (b) 1 nm using DPSK modulation technique and (c) 0.1 nm and (d) 1 nm using QAM modulation technique.

(a)

(b)

(c)

(d)