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A tunable optoelectronic oscillator using a high finesse etalon as both a photonic filter and optical frequency reference is presented. The microwave tone at 10.487 GHz displays fractional frequency instability of 3.3×10−10 at 1 s.
The development of a novel metamaterial enhanced photonic RF receiver is presented. The receiver consists of a D-ring structure designed on an electro-optic LiNbO3 substrate to achieve direct modulation of RF signal into optical sideband. The optimized D-ring design provides strong electric field confinement, thereby resulting in significant improvement in detection sensitivity. Theoretical modeling,...
Using a coherent optical demodulation technique, we have independently measured the AM and PM resulting from current modulation at GHz rates of an I.L. VCSEL at 1.55 µm. The variation of the depth of AM and PM are measured as function of RF modulation frequency and power. Two regimes of modulation for the I.L. VCSEL are explored: 1) At low frequencies < 10 MHz where thermal modulation dominates...
Cancellation of interfering and resultant distortion signals in a coherent optical down-converting RF receiver is demonstrated. The technique requires no additional signal path hardware, introduces no signal degradation and offers an attractive off-antenna cancellation capability
Concept feasibility of a photonics-enabled Ka-band subscale “radar” is demonstrated for ranging. Experimental results using a corner cube reflector and stretch processing are presented, with a 28-GHz carrier modulated by 40-ns, 4-GHz chirp pulses.
Optical frequency combs generated by electro-optic modulation form a coherent multi-carrier light source for flexible microwave photonic filtering. Various filter experiments demonstrating high sidelobe suppression, deep submicrosecond tuning, and pulse compression capability are described.
Sensitivity and dynamic range data is presented for a wideband staring RF spectrum analyzer based on parametric multicasting and spectral slicing with a periodic optical filter.
Modified uni-traveling carrier (MUTC) photodiodes with diameter of 28 µm and 20 µm flip-chip bonded on AlN substrate demonstrated RF output power of 25 dBm and 19 dBm at 25 GHz and 30 GHz, respectively.
The architecture of an optically addressed ultra-wideband (2–40 GHz) phased array, based on microwave photonic down-conversion techniques, is described. For such a phased array, the transmitter module consists of an ultra-wideband antenna, photodiode, and power amplifier. A metamaterial-loaded Vivaldi antenna having a tailored, broad, flat-top radiation pattern and a broad impedance bandwidth is presented...
A 22 GHz AlInGaAs two-section mode-locked laser is presented here. 860 fs optical pulses with timing jitter of 280 fs (1 Hz–100 MHz) are generated by direct RF modulation of the saturable absorber.
We present a method to independently measure the spectral phase of an optical frequency comb by heterodyning it with a second comb of arbitrarily detuned repetition rate and appropriately processing the resulting electrical frequency comb.
We report the first experimental observation of periodic oscillations in an optically spin-injected GaInNAs/GaAs 1300 nm VCSEL under CW pumping and operated at room temperature. We show that the stability of the VCSEL can be controlled with the pump ellipticity. 11 GHz periodic oscillations were observed with the device subject to circularly-polarized (left or right) optical pumping. The highest RF...
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