1550-nm single-mode grating-outcoupled surface emitting lasers

Abstract

Single-frequency grating outcoupled surface emitting (GSE) semiconductor lasers emitting at 1550 nm with output powers exceeding 1.6 mW into a multi-mode fiber, threshold currents below 25 mA and with > 30 dB side-mode suppression ratios are reported. These lasers consist of a 500 µm long horizontal cavity, and a 10 µm long second-order outcoupler grating sandwiched between 250 µm long first-order distributed Bragg reflector (DBRs) gratings. Higher output powers can be achieved with longer outcoupler gratings. These GSE lasers operate at 2.5 Gbps and have a full-width at half-maximum (FWHM) beam divergence of 5 x 9 degrees.

Low-cost CWDM transmitter package

“…Thus, for example, four wavelengths each modulated at 3.125 Gigabits/second can be multiplexed to yield a single 10 Gigabit/second link (the extra 2 Gb/s provides overhead for error prevention in CWDM systems). The multiplexer package described in this report incorporates a Grating-outcoupled Surface-Emitting (GSE) laser 1,2,3,4 which is shown in Fig. 1.…”