Passive Optical Networks

signal from the AWG with an output of the power splitter. Figure 3.9 shows the

spectra from the output ports of the 18 2P1 device measured around the

1:3-mm waveband (Fig. 3.9 (a)) and 1:55-mm waveband (Fig. 3.9 (b)). For

wavelengths in the range from 1:26 mmto1:36 mm, the average insertion loss is

12 dB with a 2-dB variation around the value measured at 1:30 mm. The trans-

mission spectra measured in the 1.55-m window show two free spectral ranges

PS

DWDM

CWDM-2

CWDM-R

CWDM-1

Figure 3.8 Schematic illustration of 18 two-PONs-in-one (2P1) device. For clarity, the

vertical scale has been expanded by four times. (From Ref [14])

0

−10

−20

−30

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