Engineering topics
Publications and source records attributed to Shieh, W..
Close-in optical interferometric noise spectrum and its conversion to RF close-in phase noise are theoretically and experimentally studied. The study also indicates that reflective type devices and optically amplified links enhance the interferometric phase noise degradation.
Two WDM channels at 1320 nm and 1312 nm carring RF signals are simultaneously up/down converted by a fiber-based optoelectronic oscillator. The conversion efficiency are found to be ~ -8 dB and the incoming signals has no effects on the local oscillator spectral purity.
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An all-optical microwave mixer with an 8dB RF gain is demonstrated by using a semiconductor optical amplifier (SOA). 6GHz RF signal on a 1312 nm optical carrier is up-converted and down-converted to 1GHZ and 11 GHz by a 5GHz local oscillation (LO) signal on a 1320 nm optical carrier. Such a carrier could readily extend to millimeter wave range.