Yenista Optics has released a tunable laser in the 1310-nm-wavelength region. The Tunics T100R uses a new optical cavity design to provide optical power of 6 dBm with a low-noise >80 dB/0.1-nm signal-to-spontaneous-emission ratio. Patented self-filtered external cavity laser technology enables the combination of low noise and high power. The O-band laser operates from 1270 to 1340 nm and is suitable for characterizing narrow-bandwidth filters and for functioning as a light source for testing high-speed transmission systems. Engineers developing and testing components for 40- and 100-Gigabit Ethernet and fiber-to-the-home/passive optical networks find the laser beneficial. Proprietary Optim-Y technology delivers high wavelength accuracy and mode-hop-free operation with no amplified spontaneous emission. The laser operates in sweeping and step-by-step modes.