Jm. Verdiell et al., WDM RECEIVER WITH INTEGRATED OPTICAL PREAMPLIFIER, ASPHERIC LENS AND GRATING FILTER, Electronics Letters, 29(11), 1993, pp. 992-993
A photonic integrated circuit implementing a receiver with an optical
preamplifier and a wavelength filter for dense WDM systems has been fa
bricated. The integrated filter is based on planar optics and formed b
y a waveguide lens and Bragg grating combination. This arrangement pro
vides a narrow filtering response of 0.4 nm and a high sidemode reject
ion ratio of 20 dB. A monolithically integrated pre-amplifier and phot
odetector are also incorporated to allow for high-sensitivity and high
-speed operation.