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Optical waveguide device and manufacturing method of optical waveguide device

A technology of optical waveguide and waveguide, which is applied in the direction of optical waveguide light guide, light guide, optical element, etc.

Active Publication Date: 2014-09-24
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 90° optical hybrid interferometer disclosed in the above-mentioned non-patent literature, the arms 63 and 65 are longer than the other arms by the above-mentioned optical path difference

Method used

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  • Optical waveguide device and manufacturing method of optical waveguide device
  • Optical waveguide device and manufacturing method of optical waveguide device
  • Optical waveguide device and manufacturing method of optical waveguide device

Examples

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no. 1 example

[0025] figure 1 is an exemplary diagram showing the structure of an optical waveguide device of a preferred embodiment of the present invention. Such as figure 1 As shown, the optical waveguide device is equipped with optical waveguide lines 1 and 2 . Each of the optical waveguide lines 1 and 2 has an input terminal 5 connected to the waveguide 3, and the optical signal input from the input terminal 5 is branched to optical paths 15-18, and output from sequentially arranged output terminals 11-14. In addition, each of the optical waveguide lines 1 and 2 has an input terminal 6 connected to the waveguide 4, and the optical signal input from the input terminal 6 is branched to optical paths 19-22, and output from sequentially arranged output terminals 11-14.

[0026] The optical waveguide lines 1 and 2 have optical lines, and the optical lines give the optical signals propagating along the optical paths 16-22 respectively π, π / 2, 3π / 2, 0, π, π / 2, 3π / 2 phase difference. In ...

no. 2 example

[0030] figure 2 is an exemplary diagram showing the composition of an optical waveguide of a 90° optical hybrid interferometer according to a second embodiment of the present invention. exist figure 2 Among them, the signal optical input ports 31 and 32 respectively receive TE and TM optical signals respectively having separated polarized waves. The signal optical waveguide arms 33-36 transmit TE and TM optical signals, each of which is split into two paths. The local oscillation light input port 37 receives local oscillation light, and is provided between the signal light input ports 31 and 32 . The local oscillation optical waveguide arms 38 - 41 transmit the local oscillation light branched into two paths on the TE optical signal side and the TM optical signal side and further branched into two paths respectively. The optical coupler 42 combines each pair of the signal optical waveguide arm 33 and the local oscillation optical waveguide arm 38, and outputs each pair of i...

no. 3 example

[0039] image 3 is an exemplary diagram showing the optical waveguide composition of the 90° optical hybrid interferometer of the third embodiment of the present invention. exist image 3 , use the same code to markup with figure 2 corresponding parts.

[0040] In the third embodiment, all of the Mach-Zehnder interferometers 54-57 are used as optical couplers. Also, the local oscillation optical waveguide arms that impart a π / 2 phase difference to the local oscillation light are the arm 39 and the arm 41, and all the upper optical waveguides of the Mach-Zehnder interferometers 54-57 are longer than the lower optical waveguides. As a result, the output interference characteristics of each Mach-Zehnder interferometer itself are all equal, and the phase difference according to the difference in phase conversion characteristics is zero. In addition, in the signal optical waveguides 33, 34, 35, and 36, each section (from the branching section to the optical coupler) constituti...

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Abstract

The present invention proposes a 90° optical hybrid interferometer, a pair of optical signal waveguide arms and a local oscillator optical waveguide arm on the I phase side or Q phase side of the TE optical signal side and the TM optical signal side respectively have an optical path difference, Phase delays are thereby imparted to the output interference signals on the I-phase side and the Q-phase side. By setting the output phase difference as +π / 2, the 90° optical hybrid interferometer has eight output ports arranged in the order of Ip, In, Qp and Qn on the TE side and the TM side, respectively, and the output phase difference is The sum of the phase difference and the phase delay according to the optical path difference and the phase conversion characteristics of each optical coupler on the I-phase side and the Q-phase side.

Description

[0001] This application is based on and claims priority from Japanese Patent Application No. 2010-064473 filed on March 19, 2010, the entire disclosure of which is incorporated herein by reference. technical field [0002] The invention relates to an optical waveguide device, in particular to a 90° optical hybrid interferometer composed of a planar light wave circuit (circuit) using the optical waveguide technology. Background technique [0003] In ultra-high-speed communication exceeding 100 Gbit / s, recent interest has focused on a communication technology of DP-QPSK (Dual Polarization Differential Quadrature Phase Shift Keying) that is excellent in wavelength utilization, reception characteristics, and dispersion compensation capabilities. A receiver for a DP-QPSK system requires a function of separating an optical signal into polarized waves and a 90° optical mixing function of deriving phase information from the polarized waves. The phase information is four-valued phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/125G02B6/13
CPCH04B10/61G02B6/125Y10T156/10
Inventor 渡边真也
Owner NEC CORP
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