Title :
A high-performance optically injected synchronous oscillator
Author :
Ma, Z. ; White, M.H. ; Williams, K.J. ; Esman, R.D. ; Uzunoglu, V.
Author_Institution :
Sherman Fairchild Center for Solid State Studies, Lehigh Univ., Bethlehem, PA, USA
fDate :
4/1/1992 12:00:00 AM
Abstract :
An improved optical injection network incorporating a high-speed p-i-n photodiode into a microwave synchronous oscillator (SO) is presented. The p-i-n photodiode directly injects current converted from a modulated optical signal into the SO tank circuit. The SO possesses an adaptive gain function to amplify a low-level input signal to +7 dBm, and tracks the frequency deviation of the input signal to achieve synchronization. A tracking bandwidth up to 8 MHz has been observed, which is a factor of 10 better than previous results with the same optical injection power. Within the tracking bandwidth, the FM noise is significantly reduced and frequency/phase jitter is substantially removed. This technique is applicable to fiber-optic communication systems for the applications of clock/carrier recovery and coherent demodulation.<>
Keywords :
frequency modulation; microwave oscillators; optical links; optical modulation; p-i-n diodes; photodiodes; 8 MHz; FM noise; adaptive gain function; carrier recovery; clock recovery; coherent demodulation; communication systems; direct current injection; fiber-optic; frequency deviation; frequency jitter; high-performance optically injected synchronous oscillator; high-speed p-i-n photodiode; low-level input signal; microwave synchronous oscillator; modulated optical signal; optical communications equipment; optical injection network; optical injection power; phase jitter; synchronization; tank circuit; tracking bandwidth; Bandwidth; Circuits; Frequency; High speed optical techniques; Microwave oscillators; Optical fiber networks; Optical modulation; Optical noise; PIN photodiodes; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
