Speaker
Description
Development of optical links with 850 nm multi-mode vertical-cavity surface- emitting laser (VCSEL) has advanced with the transmission rate achieving beyond 25 Gbps. For applications in high-energy experiments, the transceivers are required for tolerance in ionizing and particle radiation fields. We report on prototyping of a transmitter developed for high speed transmission with the dual-channel LOC65 laser driver and the 850 nm VCSELs of types qualified for 10 Gbps and 25 Gbps in TOSA assembly. The LOC65 chips fabricated by the TSMC 65 nm process are packaged in QFN-40 format. The modules and test kits were first made with PCB of FR-4 material, and the performance reached 14 Gbps. The speed exceeds the expected and therefore the electronic design was revised for higher performance. The PCB material is replaced by the Megtron-6 and the circuit layout is optimized for 25 Gbps data transmission. To differentiate the performance dragged by slow components, the test samples are also made with 10 Gbps TOSA and the eye-diagram observed is qualified for 15 Gbps. The best equipped transmitters have achieved high speed performance with the eye-diagrams showing a 20% margin with a 25 Gbps mask.
| Submission declaration | Original and unpublished |
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