Compact optical amplifier

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The optical amplifier has a waveguide including a core and a cladding. The cladding at least partially surrounds the core and is doped with at least one species of rare earth ion in the range of 5 to 75 wt %. In another embodiment, the core is doped with Er3+ in the range of 7 to 9 wt % and with Yb3+ in the range of 11 to 13 wt %.