Publications by authors named "Erik J Norberg"
Mode control in a laser cavity is critical for a stable single-mode operation of a ring laser. In this study we propose and experimentally demonstrate an electrically pumped parity-time (PT)-symmetric microring laser with precise mode control, to achieve wavelength-tunable single-mode lasing with an improved mode suppression ratio. The proposed PT-symmetric laser is implemented based on a photonic integrated circuit consisting of two mutually coupled active microring resonators.
View Article and Find Full Text PDFSecond and third-order monolithically integrated coupled ring bandpass filters are demonstrated in the InP-InGaAsP material system with active semiconductor optical amplifiers (SOAs) and current injection phase modulators (PMs). Such integration achieves a high level of tunability and precise generation of optical filters in the RF domain at telecom wavelengths while simultaneously compensating for device insertion loss. Passband bandwidth tunability of 3.
View Article and Find Full Text PDFArticle Synopsis
- An etched beam splitter (EBS) using frustrated total internal reflection (FTIR) is created based on InP/InGaAsP materials, noted for its small size (8x11 μm) and versatile coupling ratios.
- A pre-etching process enables precise control of coupling gaps, resulting in couplers with low insertion loss (1-2.6 dB) and minimal transmission cross-coupling (≤ 10%).
- The EBS shows stable performance across the C-band, making it ideal for wavelength division multiplexing and is successfully integrated with semiconductor optical amplifiers and phase modulators to create tunable channelizing filters and an EBS-coupled ring laser.