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AssigneeAlcatel Submarine Networks
InventorsSebastien Bigo, Emmanuel Desurvire
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The invention relates to an adjustable optical amplitude and phase modulator using a non-linear optical loop mirror having two control inlets and a signal inlet. In a preferred embodiment, a single clock signal is split into two and applied to the two control inlets. The invention also relates to a soliton regenerator including said optical modulator. In an important variant, said modulator receives a soliton bit train on its signal inlet at a bit rate f.sub.s, and on its control inlets it receives a clock signal at half that frequency f.sub.c =f.sub.s /2. In an advantageous embodiment, said clock signal is applied with a phase shift of .pi. between the two control inlets, so as to minimize the effects of collisions between solitons. The invention is applicable to long distance telecommunications by optical fiber.
An optical signal amplitude modulator for amplitude modulating an optical signal, said modulator comprising:
A method of regenerating solitons in which solitons to be regenerated are injected to the signal inlet of a NOLM via a first inlet/outlet optical coupler having a coupling coefficient of .xi./(1-.xi.), while a first optical control signal is injected into the NOLM in a first propagation direction via a second optical coupler in order to modulate said solitons by said first optical control signal and to deliver said solitons modulated in this way via said first optical coupler, wherein a second optical control signal is injected into the NOLM in a second propagation direction via a third optical coupler, the second propagation direction being different from the first, and said first and second optical control signals having a relative phase shift of approximately .pi..
An optical signal amplitude modulator comprising:
Dependencies are inferred from the claim text.