Patent ID: 6178276
Filing Date: 2001-01-23
Classification: H01S

Abstract:
A self-imaging waveguide for splitting and amplification of a light signal, comprising:(a) a first S-bend waveguide for transmitting pump light of a first wavelength;(b) a first short waveguide for transmitting signal light of a second wavelength;(c) a first multimode interference device having an input end and an output end, the input end coupled to the first S-bend waveguide and the straight waveguide, with the first multimode interference device configured so that one of the first or second wavelengths is bar self-imaged while the other wavelength is cross self-imaged;(d) a long waveguide having an input end and an output end, in which the signal light is amplified, the input end of the long waveguide being coupled to the output end of the first multimode interference device;(e) a second multimode interference device having an input end and an output end, the input end coupled to the output end of the long waveguide, with the second multimode interference device configured so that light at the second wavelength is doubly self-imaged, while light at the first wavelength is singly-self imaged;(f) a third S-bend waveguide coupled to the output end of the second multimode interference device for transmitting half the power of the amplified signal light;(g) a second S-bend waveguide coupled to the output end of the second multimode interference device for transmitting half the power of the amplified signal light; and(h) a second short waveguide coupled to the output end of the second multimode interference device for directing the pump light.