Electroabsorption modulators (EAM) based on quantum-confined Stark effect (QCSE) in multiplequantum
wells (MQW) have been demonstrated to provide high-speed, low drive voltage, and high
extinction ratio. They are compact in size and can be monolithically integrated with continuous-wave
(CW) lasers. In order to achieve both high speed and low drive-voltage operation, travelling-wave
(TW) electrode structures can be used for EAMs. The inherently low impedance of high-speed
EAMs may be transformed to values close to the standard 50Ohm impedance using periodic
microwave structures with a combination of passive transmission lines with high characteristic
impedance and active modulator sections with low impedance. Modulation bandwidths of 100GHz
(-3dBe) have been accomplished with electrical reflections lower than -10dB in a 50Ohm system.
Transmission at 80Gbit/s with non-return-to-zero (NRZ) code has been demonstrated for InP-based
TWEAMs using electronic time-domain multiplexing (ETDM), indicating the possibility of reaching
speeds of 100Gbit/s and beyond.
A packaged high speed reflective electroabsorption transceivers for radio-over-fiber applications is demonstrated. The transceiver, an AFPMD (Asymmetric vertically addressed Fabry-Perot Modulator/Detector), is successfully packaged into a standard module, originally intended for 10 Gbit/s Ethernet detectors. The packaging process and the electrical, optical and thermal performance of the packaged component are presented. A bandwidth of 6 GHz, a total reflective optical coupling loss of 7.1 dB and a responsitivity of 0.14 mA/mW are accomplished. By optimizing the operation optical wavelength and bias voltage, fifth-order nonlinearity dominates the intermodulation distortion and a spurious
free dynamic range (SFDR) of 101dB<sup><b>.</b></sup>Hz<sup>4/5</sup> at 5.554GHz can be achieved experimentally.