| dc.description.abstract | In this thesis, a none-lens-coupling optical interfaces using polymer optical waveguides is proposed to simplify the optical system of Coarse Wavelength Division Multiplexing 4-channel optical transceiver (CWDM4 optical Tx/Rx) with an aggregate data rate of 100 Gbps. The optical interface at the transmitting end of CWDM4 optical Tx/Rx including 4-channel distributed feedback lasers aligned to a polymer-based 4-wavelength Array Waveguide Grating (AWG) Multiplexer integrated on the silicon substrate. Between Multiplexer and Demultiplexer, a single-mode fiber is adopted to align. The optical interface at the receiving end of CWDM4 optical Tx/Rx, a 4-channel PIN Photodiodes assembled on a glass substrate is aligned to the polymer-based 4-wavelength AWG Demultiplexer.
The results of numerical simulation show that the optical efficiencies at interfaces of transmitting and receiving ends are -0.64 and -7.08 dBm, respectively for the worst cases. Both values are superior to the specifications of -6.5 and -11.5 dBm of Multi-Source Agreement (MSA) of CWDM4 optical Tx and Rx, respectively.
The pattern of a straight polymer optical waveguide is developed using the photo-lithography process. By defining the end facets of waveguide parallel to the crystal plane direction of <100> silicon wafer and cleaving it along the <100> direction, the end facets of waveguide is formed directly without the polish process. Although the rectangular contour is designed for original waveguides, however bell-shaped optical waveguides is obtained due to over exposure in photo-lithography process. The average measured insertion losses of bell-shaped optical waveguides are -7.23, -8.13, and -9.95 dB for various end facets W×H of 12×12, 12×7, and 7×7 um2, respectively. The corresponding simulated results are -4.45, -5.25, and -8.26 dB, respectively.
| en_US |