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AssigneeNippon Telegraph and Telephone Corporation
InventorsKunihiko Mori, Hidehiko Takara, Satoki Kawanishi, Masatoshi Saruwatari
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The present invention relates to a white pulse source that produces spectrally shaped white pulses of a constant optical output power over a wide wavelength range. The white pulse source includes a pump pulse source for generating pump pulses with a center wavelength .lambda.0 and a waveguided nonlinear optical medium with a length L. The waveguided nonlinear optical medium is characterized by two properties: the first property is that chromatic dispersion D(.lambda.0,z) at the center wavelength of pump pulses in ps/nm/km is positive at an input end of said waveguided nonlinear optical medium, where z=0, and decreases towards an output end. The second property is that said chromatic dispersion D(.lambda., z) has a maximum value D(.lambda.p(z), z) at a peak wavelength .lambda.p(z) within a range of propagation distance given by L1.ltoreq.z.ltoreq.L where 0.ltoreq.L1<L, and that said chromatic dispersion D(.lambda., z) has two zero-dispersion wavelengths, .lambda.1(z) and .lambda.2(z), where D(.lambda.1(z), z)=D(.lambda.2(z), z)=0 ps/nm/km, within a range of propagation distance z where D(.lambda.p(z), z) shows a positive value.
A white pulse source comprised by a pump pulse source for generating pump pulses having a center wavelength .lambda.0 and a waveguided nonlinear optical medium having a length of an L meter, wherein said waveguided nonlinear optical medium is characterized by two properties:
A white pulse source, having a pump pulse generation section for generating pump pulses and a waveguided nonlinear optical medium for generating white pulses by being injected with said pump pulses, comprising a power stabilization section which controls optical power of pump pulses to be input into said waveguided nonlinear optical medium for reducing a noise component in said white pulses according to a dependence of noise coefficients related to a white pulse generating process on optical power of pump pulses.
An optical pulse source, having a pump pulse generation section for generating pump pulses and a waveguided nonlinear optical medium for generating white pulses by being injected with said pump pulses, and a wavelength filter for filtering said white pulses to produce optical pulses having specific wavelength component(s), comprising a noise reduction section which controls optical power of pump pulses to be input into said waveguided nonlinear optical medium for reducing a noise component in said specific wavelength component(s) according to a dependence of noise coefficients related to a white pulse generating process on optical power of pump pulses.
Dependencies are inferred from the claim text.