Optical integrated circuit for bidirectional communications and method for producing the same
First Claim
1. An optical integrated circuit for bidirectional communications in which an optical waveguide circuit having a lower clad layer, a core and an upper clad layer formed in order on a substrate and a semiconductor light reception element is connected to an outgoing end side of said core of said optical waveguide circuit, comprising:
- a reception mode actuation portion in which a reflector for communication signal light is provided at said semiconductor light reception element,a polarization plane modulating element formed on a surface side of said upper clad layer of said optical waveguide circuit in a channel disposed to receive reflection light reflected by said reflector and arriving at the bidirectional input/output end of said optical waveguide circuit, said semiconductor light reception element for being actuated in line with a synchronization timing of reception when communication signal light is inputted into said semiconductor light reception element through said optical waveguide circuit for causing said communication signal light to be received by said semiconductor light reception element; and
a transmission mode actuation portion wherein communication signal light is reflected to said bidirectional input/output end side of said optical waveguide circuit by said reflector without actuating said semiconductor light reception element when said communication signal light is inputted into said semiconductor light reception element, in line therewith polarization plane modulation is given to said reflection light by said polarization plane modulating element, and said polarization plane modulated light being made transmission light and the same being transmitted to said bidirectional input/output end side of the core of said optical waveguide circuit.
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Accused Products
Abstract
The invention relates to an optical integrated circuit for bidirectional communications which is able to achieve a downsizing and high integration with the production cost thereof decreased. An optical waveguide circuit is formed on a substrate and a photo diode (PD) is connected to the outgoing end side thereof. The optical waveguide circuit has a circuit of an optical wavelength division multiplexer which causes communication signal light (λ1) inputted from a bidirectional light input/output port to be transmitted through a communication light selective transmission filter and to be outputted from a communication light output port and causes non-communication light (λ2) to be reflected by the communication light selective transmission filter and to outgo through a non-communication light output port. A piezoelectric element is provided on the upper part at the outgoing side of the communication light output port. When the communication signal light passing through the optical waveguide circuit is inputted into the PD 8, the PD 8 is actuated in the reception mode to receive communication signal light and is not driven in the transmission mode to reflect communication signal light toward the optical waveguide circuit side by a high reflection coating film. The reflection light is given polarization plane modulation by the piezoelectric element, and the polarization plane modulated light is transmitted from the bidirectional light input/output port.
114 Citations
12 Claims
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1. An optical integrated circuit for bidirectional communications in which an optical waveguide circuit having a lower clad layer, a core and an upper clad layer formed in order on a substrate and a semiconductor light reception element is connected to an outgoing end side of said core of said optical waveguide circuit, comprising:
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a reception mode actuation portion in which a reflector for communication signal light is provided at said semiconductor light reception element, a polarization plane modulating element formed on a surface side of said upper clad layer of said optical waveguide circuit in a channel disposed to receive reflection light reflected by said reflector and arriving at the bidirectional input/output end of said optical waveguide circuit, said semiconductor light reception element for being actuated in line with a synchronization timing of reception when communication signal light is inputted into said semiconductor light reception element through said optical waveguide circuit for causing said communication signal light to be received by said semiconductor light reception element; and a transmission mode actuation portion wherein communication signal light is reflected to said bidirectional input/output end side of said optical waveguide circuit by said reflector without actuating said semiconductor light reception element when said communication signal light is inputted into said semiconductor light reception element, in line therewith polarization plane modulation is given to said reflection light by said polarization plane modulating element, and said polarization plane modulated light being made transmission light and the same being transmitted to said bidirectional input/output end side of the core of said optical waveguide circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for producing an optical integrated circuit for bidirectional communications, wherein after an optical waveguide circuit for enabling bidirectional communications is formed on a substrate at areas other than those where a semiconductor light reception element provided with a reflector is disposed and electrode patterns are deposited and formed on the surface side of the areas, at which semiconductor light reception elements are disposed, of a substrate, semiconductor light reception elements are mounted on said electrode patterns and said semiconductor light reception elements are optically connected to an outgoing end side of a core of said optical waveguide circuit, and
a polarization plane modulating element is mounted on the surface side of said optical waveguide circuit.
Specification