Cavity detuned highly-strained GaInAs/GaAs vertical cavity surface emitting lasers (VCSELs) were investigated. Devices emitting beyond 1.2 µm of the wavelength were realized by combining conventional quantum wells emitting at 1.18 µm and large wavelength detuned cavities. Various detuning conditions from -35 to 80 nm were compared for clarifying the detuning effect. The longest wavelength was 1.27 µm for an 80 nm detuned device. The highest operating temperature of a 55 nm detuned device was 140 °C under cw operation. It was found that approximately 50 nm detuning was necessary to reach the threshold gain level for a large detuned device and the condition was produced by self-heating. Relaxation resonance frequencies were characterized and over 2 GHz was observed even for a 1.27 µm VCSEL.

A tapered hollow waveguide multiplexer is proposed to combine the output of a GaInAs/GaAs multi-wavelength VCSEL array for coupling into a multi-mode fiber. The design of the proposed hollow waveguide is presented based on ray optics. We demonstrate multiplexing of 4-channel output of a GaInAs/GaAs VCSEL array formed on a patterned substrate for coupling into a multi-mode fiber. The proposed hollow waveguide multiplexer is useful for realizing compact and lowcost WDM transceiver with a multi-wavelength VCSEL array for high capacity short reach optical networks. Keywords: VCSEL, hollow waveguide, WDM, laser array Classification: Photonics devices, circuits, and systems References[1] F. Koyama, T. Mukaihara, Y. Hayashi, N. Ohnoki, N. Hatori, and K. Iga, "Two-dimensional multiwavelength surface emitting laser arrays fabricated by nonplanar MOCVD," Electron. Lett., vol. 30, no. 23, pp. 1947Lett., vol. 30, no. 23, pp. -1948Lett., vol. 30, no. 23, pp. , 1994

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Articles you may be interested inMultiwavelength fabrication of vertical-cavity surface-emitting lasers based on asymmetric one-dimensional photonic crystal

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