Jun Liu, Qingzhong Huang, Shiqi Tao, Cheng Zeng, Jinsong Xia, "Low-cost hybrid integrated 4 × 25.78 Gb/s CWDM TOSA for 10 km transmission using DFB-LDs and an arrayed waveguide grating multiplexer," Photonics Res. 6, 1067 (2018)
- Photonics Research
- Vol. 6, Issue 11, 1067 (2018)
Fig. 1. Proposed TOSA configuration. (a) Cross-sectional view of the TOSA. (b) Side view of the butt-coupling region. (c) Top view of the coupling region with the DFB-LDs connected with an FPC. (d) Top and side views of silicon sub-mount.
Fig. 2. Coupling efficiency as a function of d
Fig. 3. (a) Schematic of the silica-PLC AWG. (b) Scanning electron microscope image of the PLC waveguide before the depositing of cladding. (c) Transmission spectra of the silica-PLC AWG.
Fig. 4. Measurement setups for (a) the proposed scheme and (b) the lens-based solution. (c) Relative CE as a function of position variation. (d) Output power degradation after UV adhesive curing.
Fig. 5. (a) Photograph of the fabricated silica-PLC sub-block. (b) External dimension of the developed TOSA. (c) Top and side views of the butt-coupling region.
Fig. 6. (a) Output power of the packaged TOSA as a function of injection current for the four lanes. (b) Lasing spectra of the TOSA at an injection current of 40 mA.
Fig. 7. Small-signal frequency response of S21 when each DFB-LD was discretely driven.
Fig. 8. Eye diagrams for the BtoB transmission of the TOSA.
Fig. 9. Bit error ratio characteristics for BtoB and after a 10 km transmission, when all four lanes were driven using the eye diagram condition shown in Fig. 8 .
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