Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2008-07-15
2008-07-15
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Particular coupling structure
C385S037000, C385S024000, C385S046000, C385S028000
Reexamination Certificate
active
07400800
ABSTRACT:
An arrayed waveguide grating type optical multiplexer/demultiplexer circuit in which wavelength dispersion is reduced. An input wave guide (1), a first slab waveguide (2), an arrayed waveguide (3), a second slab waveguide (4) and an output waveguide (5) are connected sequentially. Furthermore, a parabola waveguide (6) is provided between the input waveguide (1) and the first slab waveguide (2), and a taper waveguide (7) is provided between the second slab waveguide (4) and the output waveguide (5). A parabola waveguide length Z0exists in a range Za,0=Z0=Zp,0determined by a parabola waveguide length Za,0where the ratio of absolute amplitude between the main peak and the first side peak in the field distribution of far-field of the parabola waveguide (6) has an upper limit of 0.217, and a parabola waveguide length Zp,0where the relative phase of the main peak and the first side peak in the field distribution of far-field has a lower limit of 3.14 radian.
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Hibino Yoshinori
Inoue Yasuyuki
Ito Mikitaka
Kaneko Akimasa
Kitoh Tsutomu
Font Frank G.
Nippon Telegraph & Telephone Corporation
NTT Electronics Corporation
Wong Eric
Workman Nydegger
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