Optical waveguide device and manufacturing method of optical waveguide device

An optical waveguide device manufacturing method comprising the steps of:

• forming a first clad layer on a substrate;
• laminating a core layer on said first clad layer;
• forming a core by patterning said core layer;
• covering said core with a second clad layer having the same refractive index as said first clad layer;
• wherein:
• said patterning of said core layer is performed with a patterning mask and compose a core pattern of:
• optical waveguide circuits, for outputting an optical signal inputted from a first input terminal with a first waveguide being connected to from an ordered arrayed first to a fourth output terminals by having branched into a first to a fourth optical paths, and for outputting an optical signal inputted from a second input terminal with a second waveguide being connected to from an ordered arrayed first to fourth output terminals by having branched into a fifth to an eighth optical paths, respectively;
• and wherein
• said first and said second optical waveguides comprise:
• an optical circuit for giving a phase difference of π, π/2, 3π/2, 0, π, π/2, 3π/2 to optical signals which are transmitted along said second to said eighth optical paths respectively to an optical signal which travel along said first optical path;
• an optical coupler for multiplexing optical signals which travel along said first to said fifth optical paths, optical signals which travel along said second to said sixth optical paths, optical signals which travel along said third to said seventh optical paths, and optical signals which travel along said fourth to said eighth optical paths respectively, and outputting to said first to said fourth output terminals respectively;
• and wherein
• said optical waveguide circuit is arranged in order to have said first to said fourth output terminals of each circuit to be arrayed as mentioned above;
• and
• said first and said second waveguides have a configuration of not to cross until an optical signal is inputted to said first and said second input terminals.