EP0919840A1
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EP
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Optical waveguide circuit, its manufacturing method and optical waveguide module having the optical waveguide circuit
Assignee: NTT Electronics Corp
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Filing: 1998-02-16
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Granted: —
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Expires: 2018-02-16
Abstract
Abstract In a lightwaveguide circuit including a plurality of waveguides having different length, a material (10) having a temperature coefficient of a refractive index including a symbol different from that of a temperature coefficient of an effective refractive index of the waveguide (4) is charged into a groove (12) formed by removing the upper clad and the core from the waveguide (4), or a groove (12) formed by removing the upper clad, the core and the lower clad from the waveguide (4). A difference in length of the removed portions between adjacent waveguides is proportional to a difference in length of the waveguides which were not removed and remained. <IMAGE>
Inventors
- 👤 Yasuyuki A-302 Sun-Green-Heights INOUE
- 👤 Akimasa 3-403 NTT-Shataku KANEKO
- 👤 Hiroshi B-302 Sun-Green-Heights TAKAHASHI
- 👤 Fumiaki Hanawa
- 👤 Kuninori 307 Port-Hill II HATTORI
- 👤 Kenji 304 Sanrei-Tsuchiura YOKOYAMA
- 👤 Senichi Suzuki
- 👤 Shin Sumida.
- 👤 Katsunari Okamoto
- 👤 Motohaya A-301 Sun-Green-Heights ISHII
- 👤 Hiroaki 202 Highland-Court H YAMADA
- 👤 Takashi 1-201 NTT-Higashiharahutaku YOSHIDA
- 👤 Koichi 2-204 NTT-Shataku ARISHIMA
- 👤 Fumihiro 1681-3 Motokomezaki EBISAWA
- 👤 Motohiro Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:02
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/10; G02B6/12; G02B6/12007; G02B6/12009; G02B6/12011; G02B6/12014; G02B6/12023; G02B6/12026; G02B6/12028
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
A lightwaveguide circuit including a plurality
of waveguides of different lengths, wherein each of said waveguides comprises a lower clad, a
core and an upper clad, a material having a temperature coefficient of a
refractive index of a symbol different from that of a
temperature coefficient of an effective refractive
index of said waveguide is charged into at least one of
a groove formed by removing said upper clad and said
core from said waveguide, and a groove formed by
removing said upper clad, said core and said lower clad
from said waveguide, and a difference in length of the removed portions
between adjacent waveguides is proportional to a
difference in length of said waveguides which were not
removed and remained.
Claim 2
Dependent Claim
24 words
A lightwaveguide circuit according to claim 1,
wherein each of said lower clad, said core and said
upper clad is made of quartz glass.
Claim 3
Dependent Claim
59 words
A lightwaveguide circuit according to claim 1
or 2, wherein beam collimator waveguides or lenses are
formed in front and rear of said groove formed by
removing said upper clad and said core from said
waveguide, and in front and rear of said groove formed
by removing said upper clad, said core and said lower
clad from said waveguide.
Claim 4
Dependent Claim
65 words
A lightwaveguide circuit according to claim 1
or 2, wherein said plurality of waveguides comprise an
arrayed-waveguide having a length which is sequentially
increased by a predetermined length, said lightwaveguide circuit further comprises a
slab waveguide connected to opposite ends of said
arrayed-waveguides, and a groove crossing said arrayed-waveguides and
having a width which is sequentially increased is
formed in intermediate portions of said arrayed-waveguides.
Claim 5
Dependent Claim
59 words
A lightwaveguide circuit according to claim 1
or 2, wherein said plurality of waveguides comprise an
arrayed-waveguide having a length which is sequentially
increased by a predetermined length, said lightwaveguide circuit further comprises a
slab waveguide connected to opposite ends of said
arrayed-waveguides, and a groove having a width which is sequentially
increased is formed in said slab waveguide.
Claim 6
Dependent Claim
49 words
A lightwaveguide circuit according to claim 1
or 2, wherein said plurality of waveguides comprise two
arm waveguides having different lengths, said lightwaveguide circuit further comprises a
directional coupler connected to opposite ends of said
arm waveguides, and longer one of said arm waveguides is formed with a
groove.
Claim 7
Dependent Claim
51 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein an absolute value of a
temperature coefficient of a refractive index of said
material charged into said groove is equal to or
greater than 20 times of a temperature coefficient of
an effective refractive index of said waveguide.
Claim 8
Dependent Claim
31 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein said groove crosses said
channel waveguide or said arm waveguide at an angle of
80 to 85 degrees.
Claim 9
Dependent Claim
18 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein said groove are provided
plurally.
Claim 10
Dependent Claim
23 words
A lightwaveguide circuit according to claim 9,
wherein at least two or more of said plurality of
grooves are connected to one another.
Claim 11
Dependent Claim
20 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein an angle of said groove is
rounded.
Claim 12
Dependent Claim
26 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein said material charged into
said groove is polysiloxane or a cross-linker of
polysiloxane.
Claim 13
Dependent Claim
40 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein said material charged into
said groove includes polyolefin providing at its
terminal end with at least one of OH group, thiol group,
carbonyl group and halogen group.
Claim 14
Dependent Claim
42 words
A lightwaveguide circuit according to any one
of claims 4 to 6, wherein said groove is formed in a
region defined in said lightwaveguide, and said groove
and material charged into said groove are airtightly
sealed by a lid covering said region.
Claim 15
Dependent Claim
35 words
A lightwaveguide circuit according to claim 14,
wherein instead of said lid, said groove and material
charged into said groove are covered with a material
which is different from said material charged into said
groove.
Claim 16
Dependent Claim
32 words
A lightwaveguide circuit according to claim 4
or 5, wherein an optical fiber for introducing an input
light is connected to a predetermined position of an
end portion of said slab waveguide.
Claim 17
Dependent Claim
28 words
A lightwaveguide circuit according to claim 4
or 5, wherein separated two lightwaveguide circuits are
connected on a straight line crossing at least one of
said slab waveguides.
Claim 18
Dependent Claim
60 words
A lightwaveguide circuit according to claim 17,
wherein a boundary line between said connected two
lightwaveguide circuits is passed through a first slab
waveguide and is substantially perpendicular to a line
connecting an input waveguide and said arrayed-waveguide,
or is passed through a second slab waveguide
and is substantially perpendicular to a line connecting
an output waveguide and said arrayed-waveguide.
Claim 19
Dependent Claim
72 words
A producing method of a lightwaveguide circuit
according to any one of claims 16 to 18, wherein when
said slab waveguide and an input fiber are connected to
each other, or said slab waveguides are connected to
each other, a light having service wavelength is
transmitted to determine a relative position of both
the two members such that a loss of the light becomes
minimum, thereby adhering and fixing the two members.
Claim 20
Dependent Claim
94 words
A producing method of a lightwaveguide circuit
according to any one of claims 16 to 18, wherein when
said slab waveguide and an input fiber are connected to
each other, or said slab waveguides are connected to
each other, a light having a wide band wavelength
spectrum is transmitted to make an alignment in a
direction perpendicular to a substrate such that a loss
of the light becomes minimum, and to make an alignment
in a direction parallel to said substrate such that a
wavelength providing the maximum transmission ratio
becomes a predetermined value.
Claim 21
Dependent Claim
91 words
A lightwaveguide circuit module comprising one
or a plurality of input fibers and one or a plurality
of output fibers, as well as a lightwaveguide circuit,
a boot, a case and a buffer material according to any
one of claims 1 to 19, wherein said input and output
fibers are connected and fixed to an end surface of
said lightwaveguide circuit, said input and output
fibers are fixed to said boot, said boot is fixed to
said case, and said buffer material is charged between
said case and said lightwaveguide circuit.
References Cited (Backward Citations)
No citation records indexed.
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