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We demonstrate 940-nm vertical-cavity surface-emitting lasers (VCSELs) with record-high -3 dB electrical-to-optical bandwidths of 40 and 32 GHz under room-temperature and 85 °C operations, respectively. The combination of Zn-diffusion with oxide-relief apertures inside the VCSEL cavity structure can greatly reduce the differential resistance and parasitic capacitance, which leads to an enhancement in the resistance-capacitance (RC)-limited bandwidth. Devices with different sizes of oxide-relief apertures are analyzed by use of the measured S21 and S11 two-port scattering parameters and equivalent circuit modeling techniques. For a device with a 3-μm diameter oxide-relief aperture, the extracted intrinsic bandwidth can be as high as 46.3 GHz. By using this novel device as the transmitter, we can achieve 60 Gbps error-free [bit-error-ratio (BER) <1 × 10-12] on-off keying transmission over a 1-m OM5 fiber under room temperature (RT) operation, without using any signal processing. In addition, invariant 50-Gbps transmission performance from RT to 85 °C operations, over a 100-m OM5 fiber has also been successfully demonstrated (with a BER < 1 × 10-7).
|Journal||IEEE Journal on Selected Topics in Quantum Electronics|
|State||Published - 1 Nov 2019|
- Semiconductor lasers
- vertical-cavity surface emitting lasers (VCSEL)
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