0.98 Microns Strained Single Quantum Well Lasers Launching High Optical Power in a Single-Mode Fiber,
NIPPON TELEGRAPH AND TELEPHONE CORP IBARAKI OPTO-ELECTRONIC LABS
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Erbium-doped optical fiber amplifiers EDFA pumped by 0.98-um laser diodes exhibit a small noise figure 1 and small temperature-induced variation in amplification compared with pumping by 1.47-um laser diodes 2. Recently, considerable research interest has focused on 0.98-um laser diodes 3-8. For practical application of EDFAs, however, optical power coupled to a single-mode fiber SMF is the key issue, a subject that few studies have addressed. In order to obtain high optical power in a SMF, we have improved the mode field emitted from lasers. Employing narrow-ridge waveguide lasers, we have sought to realize transverse lateral mode stabilization. We have also investigated epitaxial layer structures to enlarge optical spots for stabilizing the mode field and also for decreasing the vertical beam divergence. Aging test results are also described.
- Electrical and Electronic Equipment
- Fiber Optics and Integrated Optics
- Lasers and Masers