Compact hybrid-integrated multi-port multi-wavelength laser source based on high-power DFB laser array for optical...

Area of Science:

• Photonics and Optical Engineering
• Integrated Optics
• Laser Technology

Background:

• Optical input/output (I/O) technology requires high-bandwidth solutions.
• Existing systems face limitations in carrier density and integration.
• Dense wavelength division multiplexing (DWDM) is crucial for increasing data center bandwidth.

Purpose of the Study:

• To propose and demonstrate a compact hybrid-integrated multi-port multi-wavelength laser source (MP-MWL).
• To achieve simultaneous high-power output of multiple wavelengths for optical I/O.
• To enable high-bandwidth data transmission in data centers.

Main Methods:

• Utilized a multi-wavelength distributed feedback laser array (DFB LA) with slab-coupled optical waveguide (SCOW).
• Employed the reconstruction equivalent chirp technique for precise grating phase control and single-longitudinal-mode lasing.
• Integrated the DFB LA, 8x8 multi-mode interferometer (MMI), and fiber array (FA) using photonic wire bonding.

Main Results:

• Achieved simultaneous high-power output of 8 wavelengths from 8 fibers, totaling 64 addressable carriers.
• Demonstrated side mode suppression ratios above 42 dB, wavelength spacing of 100 GHz, and deviation within ± 0.15 nm for 87.5% of wavelengths.
• Obtained clear 25 Gb/s non-return-to-zero (NRZ) eye diagrams for all 64 carriers, with relative intensity noise below -135 dB/Hz and Lorentzian linewidth at 379.9 kHz.

Conclusions:

• The proposed MP-MWL is a compact and efficient solution for optical I/O technology.
• The hybrid integration enables high-density wavelength division multiplexing for increased bandwidth.
• This technology holds significant potential for future data center optical networks.