T. Sun, Li. Zhang, A. K. Poddar, U. L. Rohde, A. S. Daryoush, "Frequency synthesis of forced opto-electronic oscillators at the X-band," Chin. Opt. Lett. 15, 010009 (2017)

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- Chinese Optics Letters
- Vol. 15, Issue 1, 010009 (2017)

Fig. 1. Block diagram of a fixed frequency OEO using a narrowband metallic cavity filter and its forced oscillation using SIL and SPLL.

Fig. 2. Comparison of measured phase noise of the free-running OEO at 10 GHz using fiber delay lengths of L = 100 , 500, and 1000 m.

Fig. 3. Coarse tuned YIG filter using a DC bias current.

Fig. 4. First-order optical transversal filter using a 3 dB optical coupler, balanced photodetectors, and an in-phase electrical combiner.

Fig. 5. Fine-tuned transversal filter using the fiber laser wavelength.

Fig. 6. Frequency synthesis using current tuning of the YIG filter.

Fig. 7. Frequency Synthesis using wavelength tuning of the fiber laser.

Fig. 8. Block diagram of the SILDPLL frequency synthesized OEO at the X-band.

Fig. 9. Single SIL with a 7 km fiber for 9 to 11 GHz.

Fig. 10. DSIL for 9 to 11 GHz.

Fig. 11. SIL dual phase locking OEO-based synthesizer phase noise performance for a 9 to 11 GHz output.

Fig. 12. DSIL dual phase locking OEO-based synthesizer phase noise performance for a 9 to 11 GHz output.

Fig. 13. Long term frequency stability (30 and 60 min) of an SIL OEO-based synthesizer.

Fig. 14. Dual self-injection phase-locking-based synthesizer stability testing for over 30 and 60 min.

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