A、 The glass core is doped with an Erbium in periodic segments of the fiber.
B、 Layers of high index ？and low index ？material are deposited on a glass substrate.
C、 Thin layers of silica glass are placed onto wafers to produce a prism-like effect.
D、 Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.
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