A S Bhushan

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—We demonstrate a new concept for analog-to-digital (A/D) conversion based on photonic time stretch. The analog electrical signal is intensity modulated on a chirp optical wave-form generated by dispersing an ultrashort pulse. The modulated chirped waveform is dispersed in an optical fiber, leading to the stretching of its envelope. We have derived(More)
—We demonstrate a new technique for implementation of fast wavelength-hopping incoherent optical code-division multiple access (CDMA). The output pulse from a mode locked laser is spectrally broadened through supercontinuum generation. This pulse is then encoded into fast wavelength-hopped time-spread waveforms through a wavelength-selective time-delay(More)
  • A S Bhushan, P V Kelkar, B Jalali, O Boyraz, M Islam, O Boyraz
  • 2001
—In this letter, we demonstrate a photonic analog-to-digital converter with time stretch (TS) preprocessor that has a sampling rate of 130 GSa/s. The system has a signal-to-noise ratio (SNR) exceeding seven effective number of bits over a 1-GHz band-width at 18 GHz. We present an analytical model of the SNR in the TS preprocessor which shows that over the(More)
We propose and demonstrate a new wavelength-division-sampling technique with high temporal resolution. A discrete-time true-time delay generates multiwavelength near-transform-limited pulses from a supercontinuum source. Pulses sample the analog signal in an electro-optic modulator and are subsequently demultiplexed in a wavelength-division-multiplexing(More)
The impact of the recently demonstrated time-stretch preprocessing on the performance of Analog-to-Digital Converter (ADC) is reported. We calculate the influence of time-stretch on the quantization noise, thermal noise and shot noise of Nyquist type ADC. We also study the effect of time-stretch on the quantization noise of converters. The results suggest(More)
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