摘要:
A travelling wave-type optical modulator (1) has a substrate (3) made of an electro-optic material, optical waveguides (6A,6B) fabricated on the top surface of the substrate, and electrodes (2A,2B,2C) for modulating an optical wave through the optical waveguide. The substrate is partially thinned from the bottom surface of the substrate to form a first thinned portion (3f) and a second thinned portion (3e) so that the thickness of the first thinned portion is set to be larger than the thickness of the second thinned portion, and the optical waveguide is positioned in the first thinned portion.
摘要:
A process for producing an optical waveguide element by thermally diffusing a metal element or a metallic compound into a substrate having a photoelectric effect, includes the steps of: forming a waveguide pattern on the substrate, said waveguide pattern comprising the metal element or the metallic compound; forming a film on a main plane of the substrate and covering the entire waveguide pattern, the film having an electro-optic effect; and effecting the thermal diffusion of the metallic element and the metallic compound.
摘要:
A travelling wave-type optical modulator has a supporting substrate (18) and a ferroelectric single crystalline layer (1A) adhered on the supporting substrate with an adhesive layer (3A). The ferroelectric single crystalline layer has thicker parts (5,8) and thinner parts (6) forming at least one ridge within the modulating region of the travelling wave-type optical modulator (20) as viewed in the cross section of the modulating region. Then, an optical waveguide (2) is formed in the thicker part of the ferroelectric single crystalline layer, and electrodes (11,21) for modulation are provided on the thinner part of the ferroelectric single crystalline layer.
摘要:
A travelling wave optical modulator comprising a substrate (2) made of a ferrodielectric electro-optic single crystal and having a pair of opposing main planes (2a, 2b), an optical waveguide (5A, 5B) formed at one of the main planes of the substrate, and a pair of electrode films (6) which apply a voltage for modulating a light transmitting through the optical waveguide and between which the optical waveguide is located, wherein the thickness (T) of each of the electrode films is not less than 20 µm and a width (S) of a gap between a pair of the electrode films is not less than 25 µm.
摘要:
An optical waveguide element includes a substrate (1) showing electrooptical effects and having a pair of opposite major planes (1A, 1B), an optical waveguide (2) formed on one major plane of the substrate, and an electrode (3) for applying a modulation signal to an optical wave transmitted through said optical waveguide. A portion (5) having a relatively small thickness is formed at a region of the substrate at least positioned correspondingly to the electrode (3), and a buffer layer (6) is formed between the substrate and the electrode. Impedance conformity with the modulation signal applied to the electrode is performed by controlling the thickness of the thin portion (5).
摘要:
An external resonator type light emitting system includes a light source oscillating a semiconductor laser light and a grating device providing an external resonator with the light soruce. The light source includes an active layer oscillaing the semiconductor laser light. The grating device includes an optical waveguide having an incident face to which the semiconductor laser is incident and an emitting face of emitting an emitting light of a desired wavelength, a Bragg grating formed in the optical waveguide, and a propagating portion provided between the incident face and the Bragg grating. Formulas (1) to (4) are satisfied.
摘要:
An external resonator type light emitting system includes a light source oscillating a semiconductor laser light and a grating device providing an external resonator with the light soruce. The light source includes an active layer oscillaing the semiconductor laser light. The grating device includes an optical waveguide having an incident face to which the semiconductor laser is incident and an emitting face of emitting an emitting light of a desired wavelength, a Bragg grating formed in the optical waveguide, and a propagating portion provided between the incident face and the Bragg grating. Formulas (1) to (4) are satisfied.
摘要:
It is provided an optical waveguide device in which the radius of curvature of a curved part of an optical waveguide can be lowered and the radiation loss of light in the curved part can be reduced. An optical waveguide device (2) has a ferroelectric optical waveguide substrate and an optical waveguide (5) formed in or on the substrate and modulating electrodes (4A,4B and 4C). The thickness of the optical waveguide substrate is 30 µm or smaller at least in a region where the optical waveguide is formed. The optical waveguide has curved part (5c,5d) having a radius of curvature of 30 mm or smaller.