850 nm Square Transversely Coupled Cavity VCSEL with Bandwidth Over 30 GHz
Nowadays,there is a growing interest in studying coupled cavity structures in vertical-cavity surface-emitting lasers(VCSEL).These structures achieve a bandwidth enhance by adding a modulated current to the main cavity and a direct current to each feedback cavity.However,the impact on device performance when the main cavi-ty is driven separately has not been thoroughly investigated.To gain a more comprehensive understanding of coupled cavity lasers,we designed and fabricated a square transverse-coupled-cavity VCSEL(TCC-VCSEL)with a side length of 30 µm×30 µm and investigated the variation of the device performance when the main cavity is driven sepa-rately.At room temperature,the-3 dB bandwidth was up to 30.1 GHz,under non-return-to-zero(NRZ)modula-tion,clear eye diagrams were obtained at a back-to-back transmission rate of 40 Gbit/s,and relative intensity noise(RIN)was-160 dB/Hz.It has been proven that a feedback cavity can have a positive impact on the characteristics of the main cavity,even without driving conditions.The TCC-VCSEL device only requires one power supply,making it highly practical for high-density integration and providing new ideas for package integration applications.
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