Abstract
Array-type optical devices are important for wavelength-division multiplexing optical communication system to achieve small footprint, mass production, and reliability. For fabricating transmitter module in an array configuration, it is difficult to achieve a passive alignment of isolator, collimating lens, and laser diode. To facilitate array isolator integration, a waveguide collimator is proposed in this work by using a low-contrast, large-core polymer waveguide. The diffraction of a guided mode propagating through a free-space region is suppressed by enlarging the guided mode. The fiber coupling loss due to the enlarged mode was overcome by incorporating an adiabatic taper structure. The excess loss of waveguide collimator including the loss through a 400-μm free-propagation region was less than 1.0 dB.
Highlights
Photonic IC technology enables manipulation of light signal on a small footprint substrate, and produces sophisticated optical devices by integrating various functional building blocks
Array-type optical devices are important for wavelength-division multiplexing optical communication system to achieve small footprint, mass production, and reliability
For fabricating transmitter module in an array configuration, it is difficult to achieve a passive alignment of isolator, collimating lens, and laser diode
Summary
Photonic IC technology enables manipulation of light signal on a small footprint substrate, and produces sophisticated optical devices by integrating various functional building blocks. For practical applications, many essential optical components, such as collimating lens, wavelength filter, isolator and wave plate are still difficult to be implemented as a waveguide component [4, 5] If these free-space planar optics could be integrated with the waveguide device on a single substrate, there will be significant progress in the production method of optical components. With a view to integrating the free-space planar optics in the polymer waveguide, a large core single mode waveguide is incorporated to produce a collimated light with small diffraction By using such a large-sized guided mode, diffraction loss through the FPR could be greatly reduced to be 0.8 dB through a 400 μm FPR
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