Abstract
High-power sources1 and optical amplifiers improve the performance of wideband fiber-optic systems by increasing the received optical power; more than 100 mW is currently possible. However, to avoid deleterious effects of high powers (>1 mW) exhibited by surface-illuminated high-frequency photodetectors (PDs),2 the PD optical power must be limited. Edge-illuminated waveguide PDs3 extend, but do not eliminate, the PD power limit. Additionally, large half-wave voltages (Vπ = 5-15 V) of external optical modulators (EOMs) result in low modulation efficiencies. The resultant large unmodulated carrier either forces the use of a pre-detection attenuator or limits the usefulness of an optical preamplifier. Efficiency improvements have been proposed by biasing the EOM below quadrature,4 however, the technique requires EOM access and is limited by second harmonic generation.
© 1994 Optical Society of America
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