Dr. Rohan Katti Profile

Dr. Rohan Katti

Assistant Professor at Bennett Univ

SPIE Involvement:

Early Career and Student Subcommittee | Author

Publications (2)

Proceedings Article | 1 April 2020 Presentation + Paper

Generation of damped sinusoidal and ultra-wideband microwave waveforms based on an optoelectronic approach

Rohan Katti, Shanthi Prince

Proceedings Volume 11358, 113580F (2020) https://doi.org/10.1117/12.2555636

KEYWORDS: Optical filters, Microwave radiation, Resonators, Microrings, Bandpass filters, Laser sources, Optical amplifiers, Filtering (signal processing), Photodetectors, Optoelectronics, Microwave photonics

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We propose, analyze and simulate a microwave photonic system for generation of damped sinusoidal and ultra- wideband (UWB) microwave waveforms based on an optoelectronic approach. In the proposed system, a pulsed laser source (PLS) of 1 fs pulse width generates pulses at a repetition rate of 1 Tbps. These train of pulses are fed as input to a silicon-on-insulator microring resonator of radius 10µm. . The wavelength of the pulsed laser source is tuned to the resonance wavelength (1555.8 nm) of microring resonator (MRR) due to which the pulses are coupled into the ring cavity and emerge at the drop port of MRR. In order to compensate for the propagation losses within the cavity, an Erbium doped fiber amplifier (EDFA) is used to amplify the signal appearing at the drop port of the MRR. This amplified signal is then detected by an InGaAs photodetector of bandwidth 40 GHz and responsivity 0.85 A/W. The generated signal at the photodetector is reshaped by a bandpass Butterworth filter. In other words, the generated photocurrent acts as an impulse to the filter, the response to which results in different shapes of microwave waveforms for different characteristics of the filter. In this paper, a bandwidth of 6 GHz and order 34 results in a damped sinusoidal waveform when the repetition rate of PLS is 1 Tbps. Variations in repetition rate of PLS results in delayed damped sinusoidal waveforms. Maintaining the bandwidth to be 6 GHz and decreasing the order of the filter results in suppression of the damped oscillations of the damped sinusoidal waveform. When the order of the filter is reduced to 4, the resultant waveform at the filter is reshaped to an ultra-wideband waveform. The frequency spectra of the generated UWB waveform covers half of the UWB frequency band spanning from 3.2 to 6 GHz. The repetition rate of the generated microwave waveforms is found to be 1 GHz. The generated damped sinusoidal waveforms and UWB waveforms will be suitable for medical imaging and high data rate, short range indoor wireless communication applications respectively.

SPIE Journal Paper | 10 February 2017

Ultrafast optical binary to gray code and gray to binary code conversion based on phase modulation in Mach–Zehnder interferometer

Rohan Katti, Shanthi Prince

OE, Vol. 56, Issue 02, 025101, (February 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.2.025101

KEYWORDS: Binary data, Phase modulation, Ultrafast phenomena, Modulators, Data conversion, Optical engineering, Logic, Receivers, Waveguides

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