Abstract
The mutual and injection locking characteristics of two integrated lasers are compared, both on and off-chip. In this study, two integrated single facet slotted Fabry–Pérot lasers are utilised to develop the measurement technique used to examine the different operational regimes arising from optically locking a semiconductor diode laser. The technique employed used an optical spectrum analyser (OSA), an electrical spectrum analyser (ESA) and a high speed oscilloscope (HSO). The wavelengths of the lasers are measured on the OSA and the selected optical mode for locking is identified. The region of injection locking and various other regions of dynamical behaviour between the lasers are observed on the ESA. The time trace information of the system is obtained from the HSO and performing the FFT (Fast Fourier Transform) of the time traces returns the power spectra. Using these tools, the similarities and differences between off-chip injection locking with an isolator, and on-chip mutual locking are examined.
Highlights
Optical injection locking of semiconductor lasers has been an area of great interest since the early1980s [1]
Injection locking can be used to generate multiple phase locked coherent outputs [4], which are required for many modern day modulation formats [5]
In order to reliably enable applications that are based on injection locked lasers in a Photonic integrated circuits (PICs), the limits of injection locking a system of integrated semiconductor lasers need to be studied
Summary
In order to reliably enable applications that are based on injection locked lasers in a PIC, the limits of injection locking a system of integrated semiconductor lasers need to be studied To carry out this investigation, it is necessary to develop a technique for efficiently detecting and measuring optical injection locking. A simpler off-chip coupling regime [11] is investigated where the lasers are isolated from each other on-chip, by reverse biasing the waveguide interconnect between the lasers, and the light from the master is coupled into the slave through an optical isolator This prevents the mutual feedback between the lasers that occurs on-chip, making the injection locking of the system less complex. New and unexpected laser interactions are found and reported in this mutual coupling regime
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