N. Souli et al., 20 GBIT S HIGH-PERFORMANCE INTEGRATED MQW TANDEM MODULATORS AND AMPLIFIER FOR SOLITON GENERATION AND CODING/, IEEE photonics technology letters, 7(6), 1995, pp. 629-631
We report on the integration of two InGaAsP-InGaAsP MQW electrosorptio
n ridge modulators and an amplifier on the same active layer. The two
modulators are separated by a 500-mu m ridge waveguide optical amplifi
er, in order to prevent electrical crosstalk, and to compensate for op
tical losses. The first modulator is used as a soliton generator, and
the second codes the generated pulses. The amplifier showed 8.2-dB gai
n for 120-mA injected current. This allowed a low fiber to fiber inser
tion loss of 9 dB for the tandem. We present here for the first time t
o our knowledge, a 20 Gbit/s operation for a tandem-amplifier device,
together with transmission experiments.