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US 6,289,142 B1Granted
Optical pulse generator
AssigneeOki Electric Industry Co., Ltd.
InventorKoji Yamada
Life of this patent
Estimating the term…
Abstract
An optical pulse generator of simple constitution being able to generate a pulse train formed of short optical pulses is provided. The optical pulse generator includes an optical modulator 10 which modulates the incident light on one end face 1a thereof and outputs the light modulated thereby from the other end face 1b thereof, and an optical phase adjuster 20 which is optically connected with the other end face 1b of the optical modulator 10, adjusts the phase of the modulated light from the other end face 1b, and again receives the modulated light of which the phase has been adjusted, through the other end face 1b.
Claims12
An optical pulse generator, comprising:
- an optical modulator having a pair of end faces and comprising an optical modulation region operable to modulate light incident on one of said end faces and to output modulated light from the other of said end faces;
- an optical phase adjuster operable to adjust a phase of the modulated light outputted from the other of said end faces and to output the phase adjusted modulated light back to the other of said end faces;
- and
- an optical reflector, wherein said optical phase adjuster is operable to adjust an optical distance between said optical modulator and said optical reflector such that a product of time that the modulated light has taken to propagate from said optical modulator back to said optical modulator after being reflected by said optical reflector and an angular frequency of the modulation light applied on said optical modulator is an odd multiple of a phase corresponding to a half wavelength of the modulation light.
1 more element
An optical pulse generator, comprising:
- an optical modulator having a pair of end faces and including an optical modulation region operable to modulate light incident on one of said end faces and a waveguide region operable to adjust a phase of the modulated light for return to said optical modulation region, wherein said optical modulation region and said waveguide region are formed on a single substrate;
- an optical antireflection film being formed on the one of said end faces of said optical modulator;
- and
- an optical reflection film being formed on the other of said end faces of said optical modulator and being operable to reflect the modulated light,
- wherein said waveguide region is operable to adjust an optical distance between said optical modulation region and said optical reflection film such that a product of time which the modulated light has taken to propagate from said optical modulation region to its return to said optical modulation region after being reflected by said optical reflection film and an angular frequency of the modulation light applied on said optical modulation region is an odd multiple of a phase corresponding to a half wavelength of the modulated light.
2 more elements
An optical pulse generator, comprising:
- an optical modulator having a pair of end faces and including an optical modulation region operable to modulate light incident on one of said end faces and a waveguide region operable to adjust a phase of the modulated light for return to said optical modulation region, wherein said optical modulation region and said waveguide region are formed on a single substrate;
- an electrode operable to impress a bias voltage on said waveguide region of said optical modulator;
- and
- an optical reflection film being formed on the other of said end faces of said optical modulator and being operable to reflect the modulated light,
- wherein said electrode applies the bias voltage on said waveguide region to change a refractive index of said waveguide region such that a product of time which the modulated light has taken to propagate from said optical modulation region to its return to said optical modulation region after being reflected by said optical reflection film and an angular frequency of the modulation light applied on said optical modulation region is an odd multiple of a phase corresponding to a half wavelength of the modulation light.
2 more elements
An optical pulse generator, comprising:
- an optical modulator having a pair of end faces and comprising an optical modulation region operable to modulate light incident on one of said end faces and to output modulated light from the other of said end faces;
- an optical phase adjuster operable to adjust a phase of the modulated light outputted from the other of said end faces and to output the phase adjusted modulated light back to the other of said end faces;
- and
- an optical reflector, wherein said optical phase adjuster is operable to adjust an optical distance between said optical modulator and said optical reflector such that a product of time that the modulated light has taken to propagate from said optical modulator back to said optical modulator after being reflected by said optical reflector and an angular frequency of the modulation light applied on said optical modulator is an odd multiple of a phase corresponding to a half wavelength of the modulation light,
- wherein said optical modulator further comprises an optical loop which is operable to feedback the modulated light output from the other of said end faces to the one of said end faces.
2 more elements
Dependencies are inferred from the claim text.