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RF crosstalk in multiple-wavelength vertical-cavity surface-emitting laser arrays

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4 Author(s)
Nakagawa, S. ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Syn-Yem Hu ; Louderback, D. ; Coldren, L.A.

We present the crosstalk measured in multiple-wavelength vertical-cavity surface-emitting laser (VCSEL) arrays under RF modulation. The array consists of eight bottom-emitting VCSEL's arranged with a "pie"-like configuration within a 60-μm-diameter circle with a 3-μm spacing for coupling into a multimode fiber. The crosstalk is investigated by measuring a cross-modulation response of two VCSEL's in the array using a monochromator in an optical spectrum analyzer as a receiver. Excess crosstalk is minimized by flip-chip mounting the array and introducing a proper bias condition. The crosstalk observed In the adjacent VCSEL's is less than -40 dB at the modulation frequency below 700 MHz and it Increases at 20 dB/decade above this frequency when both VCSEL's are biased at 5.0 mA.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 6 )