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Optical Review

Optical Signal Inversion Phenomenon for 1.5 μm Derived from the Negative Nonlinear Absorption Effect in an Erbium Nitrate Solution

Yoshinobu Maeda

Published Sep 1, 1999• 0 citations
Publisher
DOI
10.1007/s10043-999-0402-z

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Optical signal inversion phenomenon for 1.53 μm laser in an erbium-doped lithium niobate

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Modulation characteristics of a negative nonlinear absorption effect were investigated in 3 wt % erbium-doped lithium niobate using a 1530 nm laser diode. With a decreasing incident modulation degree, a reversed-phase waveform was obtained in the transmitted laser at modulation degrees smaller than 85% for a sample length of 14 mm. The reversed-phase transmitted waveforms were observed at modulation frequencies from 1 kHz to 10 GHz. The negative nonlinear absorption effect for 1.5 μm can be explained by considering an enhanced absorption model for a four-level system of the Er3+ ion.

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All-Optical Inverted Operational Amplifier Derived from the Negative Nonlinear Absorption Effect

Yoshinobu Maeda

An all-optical inverted operational amplifier derived from the negative nonlinear absorption effect in an erbium-yttrium aluminum garnet crystal was realized using an erbium-doped fiber amplifier and a feedback ring resonator. The inverted output modulation degree depended on the fiber amplifier gain and increased abruptly at a gain of more than 25 dB. The maximum value of the output modulation degree was 91% when the input modulation degree was 52%. The inverted output power was amplified by approximately 28 times the input power of 25 µW. A NOR-type logic gate operation was demonstrated using two optical signals of 1.53 µm.

Japanese Journal of Applied Physics•Jul 1, 2000•1 citation
Modulation characteristics of a negative nonlinear absorption effect were investigated in 3 wt % erbium-doped lithium niobate using a 1530 nm laser diode. With a decreasing incident modulation degree, a reversed-phase waveform was obtained in the transmitted laser at modulation degrees smaller than 85% for a sample length of 14 mm. The reversed-phase transmitted waveforms were observed at modulation frequencies from 1 kHz to 10 GHz. The negative nonlinear absorption effect for 1.5 μm can be explained by considering an enhanced absorption model for a four-level system of the Er3+ ion.
An all-optical inverted operational amplifier derived from the negative nonlinear absorption effect in an erbium-yttrium aluminum garnet crystal was realized using an erbium-doped fiber amplifier and a feedback ring resonator. The inverted output modulation degree depended on the fiber amplifier gain and increased abruptly at a gain of more than 25 dB. The maximum value of the output modulation degree was 91% when the input modulation degree was 52%. The inverted output power was amplified by approximately 28 times the input power of 25 µW. A NOR-type logic gate operation was demonstrated using two optical signals of 1.53 µm.