A polymeric, optical fibre compatible, 8x8 phased array wavelength mul
tiplexer with 400GHz (3.2nm) channel spacing, has been designed and re
alised for operation in the 1550nm erbium doped fibre amplifier (EDFA)
window. By using bending radii as small as 20mm. the device measures
only 64x4 mm. The fibre to fibre insertion loss in the passbands varie
s between 6.6 and 8.0dB and the crosstalk is -25dB.