A 16-channel optical transmitter chip with a digital transmission capacity up to 1.6 Tb/s has been demonstrated. In this chip, a 16-wavelength III–V DFB laser array (MLA), a silicon Mach-Zehnder interferometer (MZI) modulator array and a 16-channel fiber array are hybrid integrated by photonic wire bonding (PWB) technique. The MLA based on reconstruction-equivalent-chirp (REC) technique proves a good wavelength spacing uniformity of all wavelengths. Each unit laser with 1.2 mm cavity length in the MLA exhibits good single-longitudinal-mode operation with the output power over 18 dBm at an injection current of 300 mA. Spectral measurements show the channels coincide well with the designed 200 GHz spacing, with wavelength deviations within a range of ±0.2 nm. Based on PWB technique, three chips mentioned above are integrated optically on one Wu-Cu substrate as a 16-channel optical transmitter. The largest output power of optical transmitter is 1.5 mW and all channels still keep good single mode outputs after PWB integration. The tested modulation speed of each channel is up to 100 Gb/s, which implies the total transmission capacity of this device is 1.6 Tb/s.
Multi-wavelength laser arrays are critical for co-packaged optical interconnects, dense wavelength division multiplexing, high-performance optical computing, and sensors. Based on the reconstruction equivalent chirp (REC) technique, multiwavelength laser arrays (MLAs) are demonstrated with high channel count and high precision wavelength spacing. Recently, the photonic wire bonding (PWB) technique is applied to connect the MLA. But the lasers are mostly surface-emitted, such as the horizontal cavity surface-emitting lasers. In the practical applications, the lasers are usually edge-emitted, which is more difficult for the PWB technique. By using the photonic wire bonding technique, we connected a six-channel REC-based MLA, a PLC chip, and the fiber array. The lowest total transmission loss reaches to 7.8 dB. With further optimization of the PWB waveguide, the REC-based MLAs can be applied more easily, which is a potential solution for the requirement of high performance multi-wavelength light source in the relevant field.
We designed and experimentally studied a sampled Bragg grating semiconductor laser with π equivalent phase shift (EPS) and three equally separated electrodes. When the central electrode is injected different current from the other electrodes, a distributed phase shift (DPS) can be introduced into the studied laser. By changing the injection current ratio into three electrodes, the DPS can be controlled and then the lasing wavelength can be tuned while the laser keeps single longitudinal mode operation.
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