We propose and demonstrate a new wavelength-division-multiplexed (WDM)
passive optical network (PON) architecture that uses N x N waveguide
grating routers in the remote node and central office for simultaneous
multiplexing and demultiplexing of N - 1 channels in each direction.
In the demonstrated network, a spectrum-sliced fiber amplifier light s
ource was used to transmit 15 downstream channels operating at 500 Mb/
s, The 155-Mb/s upstream channels used 1.5-mu m LED's, In addition, an
erbium-doped fiber amplifier was used at the central office to compen
sate the slicing losses of low-power LED's, The crosstalk, caused by u
sing WGR's for both multiplexing and demultiplexing channels, was supp
ressed to a negligible level by using two types of bandpass filters. T
here was no significant degradation in the receiver sensitivity caused
by this crosstalk.