Abstract
Broadband gain-flattened optical amplifiers are essential for increasing the capacity of wavelength division multiplexed (WDM) transmission systems. Among the several approaches to flatten the gain of an amplifier, gain flatting filters (GFFs) based on long period gratings (LPGs) are strong candidates because of the ease of fabrication, the flexibility in spectral-shaping, and very low back reflection.1
© 2000 Optical Society of America
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