Directly Modulated Tunable Single-Mode Lasers Based on a Coupled Microcavity

In this work, we investigate an alternative directly modulated laser solution with applications to multiwavelength 25 Gb/s systems. The presented solution is based on a hybrid square/rhombus-rectangular laser (HSRRL), which consists of a Fabry-Perot (FP) cavity and a square/rhombus microcavity (SRM). This structure is implemented and demonstrates single-mode lasing over a wide wavelength tuning range (30.8 nm). Single-mode operation is achieved with a side-mode suppression ratio (SMSR) greater than 30 dB and a linewidth of 10 MHz. Furthermore, with an electrical 3 dB bandwidth of 10 GHz. It is possible to directly modulate at 25 Gb/s with promising performance. These devices are simple and they are expected to meet the cost and power requirements of current networks.

Automated summary

This work investigates an alternative solution for directly modulated lasers in multiwavelength 25 Gb/s systems. The proposed solution is based on a hybrid square/rhombus-rectangular laser and achieves single-mode lasing over a wide wavelength tuning range, with promising performance for 25 Gb/s modulation.