Exploring wavelength conversion with multicolor lasers

Samenvatting

Rising demands in optical communication systems require simple and scalable component deigns. Chip scale all optical wavelength converters can facilitate routing and switching in high capacity networks. Existing techniques based on semiconductor optical amplifiers need an additional laser to exploit their non-linear functionality. In this work we explore the dynamics of semiconductor multicolor/multiwavelength lasers. The scheme uses a single laser to perform wavelength conversion of signal. We exploit the coupling between modes of
multiwavelength laser to achieve multiplication of signal modulations from one wavelength to another.
We study the laser’s wavelength conversion mechanism both numerically and experimentally. For numerical study we develop a test bench around the rate equations for multi-mode laser. For experimental study we develop procedure to achieve stable wavelength conversion. We experimentally perform wavelength conversion of a 2-level OOK signal. We report success in achieving wavelength conversion for data rates upto 1 GBd. We also show preliminary results indicating higher baudrates with improvements in setup and modulation scheme. We corroborate our experiments with numerical results and confirm the impact of factors such as injection strength and modulation format on signal conversion quality. Our technique achieves conversion of signal by wavelengths as far as 1.3 THz and also close to 71 GHz. This indicates potential for conversion between arbitrary laser modes in alternate designs. Additionally, we augment the wavelength conversion capability with switching signal wavelengths. Using on chip feedback mechanism, we show successful signal
wavelength change with nano-second speed response.
Thus, we explore the multicolor laser’s signal processing capabilities through optical injection dynamics and mode-mode coupling. Our method offers a simple wavelength conversion technique requiring only an input signal and no additional laser probes.

Datum prijs	2023
Originele taal	English