The NLFM waveform resulting from a tunable integrated optical ring resonator is simulated and compared with the well
known tan-FM waveform. The metrics of interest are the first sidelobe levels and FWHM times of the autocorrelation,
as these directly relate to the long-range performance and fine range resolution of a LADAR system, and should ideally
be as small as possible. Through simulation, the sidelobe level of the autocorrelation of an NLFM waveform generated
by a series of tunable integrated optical ring resonators is shown to be lower than the autocorrelation sidelobe level of an
equivalent optimized tan-FM waveform with an equal FWHM time. A proof of concept experiment employing
thermally tunable Silicon Nitride integrated optical ring resonator is shown to generate NLFM chirped waveforms with
frequency chirps of 28 kHz.
A fast, non-interferometric measurement technique that allows the frequency-dependent delay and amplitude responses to be measured is presented. For a single amplitude and relative phase measurement at a fixed optical wavelength, the measurement time is on the order of a microsecond. RF modulation up to 2.7 GHz can be accommodated. A modified technique using frequency modulation is described to overcome non-idealities in the phase measurement. Results are presented for a fiber Bragg grating and an acetylene gas cell with swept-wavelength laser tuning at a rate of 40 nm/s.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.