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We demonstrate integrated waveguide microcavity filters for channelizer applications. Various filters exhibit bandwidths of BW<2 GHz (16 pm), free spectral range FSR>83 GHz (1.87 nm), and maximum finesse F=77. Several contributions to filter loss are examined.
A method for canceling dispersion-induced second harmonic by simultaneously modulating two optical wavelengths combined with balanced photodetection is demonstrated. The second harmonic is reduced by ~30 dB while the fundamental is increased by 6 dB.
All-photonic gain allows for the transmission of an ultra-low-jitter signal over 14 km of fiber. The jitter is 2.75 fs, only 0.3 fs more than back-to-back, while RF output power is increased 7.7 dB.
The impact that photodiode nonlinearities have on intensity-modulation direct-detection analog photonic links is described. The second- and third-order linearity requirements for photodiodes, quantified in terms of output intercept points, are calculated. Measured data at 1 GHz for a high-current (60-mA) partially-depleted-absorber photodiode are presented. A four-photodiode 26-mA array at 5 MHz is...
We have assembled and characterized a microwave frequency analog fiber link that offers shot-noise-limited performance at input powers above the stimulated Brillouin scattering threshold. The 20 km span of fiber consists of three pairs of alternating fibers, with each pair separated by isolators. The measured SBS threshold using the backscatter approach is 14 dBm; however, the measured relative intensity...
This paper briefly reviews the laser and photodiode requirements for high-performance intensity-modulation, direct-detection (IMDD) photonic links. A more thorough analysis is provided in two recent review articles and the references therein. As it is relevant to ongoing avionic programs, we also report on the performance of an erbium-glass microchip laser and a high-power partially-depleted-absorber...
We have designed and built a self-starting master-slave optoelectronic oscillator without any electronic amplifiers. The optoelectronic oscillator consists of a slave oscillator with 50 m of fiber that is injection-locked by a master oscillator with 2 km of fiber. Both optoelectronic oscillators use the carrier-suppression technique of low-biased Mach-Zehnder modulators to achieve the necessary RF...
Radio-frequency (RF) photonics and fiber optics play an important role in future airborne applications, leveraging advantages over traditional RF cabling such as decreased size and weight, increased flexibility, lower signal loss in fiber, larger bandwidth, and invulnerability to electromagnetic interference. In military electromagnetic warfare applications, RF links can be used route microwave signals...
We demonstrate an optoelectronic oscillator using an electroabsorption modulator to generate a low phase-noise 40 GHz optical pulse train. The oscillator has a measured phase noise of -100 dBc/Hz at 10 kHz offset from the carrier
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