Source: http://www.google.com/patents/US6600842?dq=5636223
Timestamp: 2015-05-04 08:24:45
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Matched Legal Cases: ['art 20', 'art 20', 'art 20', 'art 32', 'art 26', 'art 20', 'art 32', 'art 32', 'art 34', 'art 32', 'art 34', 'art 32', 'art 20', 'art 34', 'art 26', 'art 66', 'art 64', 'art 64', 'art 66', 'art 32']

Patent US6600842 - Semiconductor optical function device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA semiconductor optical function device has a first junction structure part which includes a first conductivity type cladding layer, a light waveguide layer and a second conductivity type cladding layer, and a second junction structure part which includes the first conductivity type cladding layer and...http://www.google.com/patents/US6600842?utm_source=gb-gplus-sharePatent US6600842 - Semiconductor optical function deviceAdvanced Patent SearchPublication numberUS6600842 B2Publication typeGrantApplication numberUS 09/887,424Publication dateJul 29, 2003Filing dateJun 25, 2001Priority dateDec 7, 2000Fee statusPaidAlso published asUS20020071621Publication number09887424, 887424, US 6600842 B2, US 6600842B2, US-B2-6600842, US6600842 B2, US6600842B2InventorsKoji YamadaOriginal AssigneeOki Electric Industry Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (7), Non-Patent Citations (8), Referenced by (14), Classifications (16), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetSemiconductor optical function device
US 6600842 B2Abstract
What is claimed is: 1. A semiconductor optical function device comprising:
a semiconductor substrate; a first junction structure part formed on said semiconductor substrate, said first junction structure part including a first conductivity type cladding layer, a light waveguide layer, and a second conductivity type cladding layer; a second junction structure part formed at a position separated from said first junction structure part on said semiconductor substrate, said second junction substrate part including said first conductivity type cladding layer and a second conductivity type sub-cladding layer; a first electrode formed on said first junction structure part; and a second electrode formed on said second junction structure part, wherein heights of said first electrode and said second electrode from a surface of said semiconductor substrate are substantially the same, and said first electrode and said second electrode are parallel to each other in a direction of propagation of light through said light waveguide layer. 2. The semiconductor optical function device according to claim 1, wherein said second junction structure part has a double heterojunction structure which further includes an non-doped layer between said first conductivity type cladding layer and said second conductivity type sub-cladding layer.
a substrate; a first junction structure part formed on said substrate, said first junction structure part including a first conductivity type cladding layer, a light waveguide layer, and a second conductivity type cladding layer; a second junction structure part formed at a position separated from said first junction structure part on said substrate, said second junction structure part including said first conductivity type cladding layer, a non-doped layer, and a second conductivity type sub-cladding layer; a first insulating layer formed on said first conductivity type cladding layer adapted to isolate said light waveguide layer and said second conductivity type cladding layer of said first junction structure part from said non-doped layer and said second conductivity type sub-cladding layer of said second junction structure part; a second insulating layer formed on said first conductivity type cladding layer at a side of said first junction structure part opposite to a side contacting said first insulating layer; a first electrode formed on said first junction structure part; and a second electrode formed on said second junction structure part, wherein heights of said first electrode and said second electrode from a surface of said substrate are substantially the same, and said first electrode and said second electrode are parallel to each other in a direction of propagation of light through said light waveguide layer. 9. The semiconductor optical function device according to claim 8,
wherein said light waveguide layer and said non-doped layer are formed as continuous layers on said first conductivity type cladding layer, said second conductivity type cladding layer and said second conductivity type sub-cladding layer are isolated by said first insulating layer formed on a side of said light waveguide layer and a side of said non-doped layer, and said second insulating layer is formed on another side of said light waveguide layer opposite to said side contacting said first insulating layer. 10. The semiconductor optical function device according to claim 9, wherein said second junction structure part has a homojunction structure which comprises said first conductivity type cladding layer and said second conductivity type sub-cladding layer.
a substrate, a first junction structure part formed on said substrate, said first junction structure part including a first conductivity type cladding layer, a light waveguide layer, and a second conductivity type cladding layer; a second junction structure part formed at a position separated from said first junction structure part on said substrate, said second junction structure part including said first conductivity type cladding layer, a non-doped layer, and a second conductivity type sub-cladding layer; a first insulating layer formed on said first conductivity type cladding layer so as to isolate said light waveguide layer and said second conductivity type cladding layer of said first junction structure part from said non-doped layer and said second conductivity type sub-cladding layer of said second junction structure part; a second insulating layer formed on said first conductivity type cladding layer at a side of said first junction part opposite to a side contacting said first insulating layer, wherein a part of said second insulating layer contacts said substrate; a first electrode formed on said first junction structure part; and a second electrode formed on said second junction structure part, wherein heights of said first electrode and said second electrode from a surface of said substrate are substantially the same, and said first electrode and said second electrode are parallel to each other in a direction of propagation of light through said waveguide layer. 14. The semiconductor optical function device according to claim 13,
wherein said light waveguide layer and said non-doped layer are formed as continuous layers on said first conductivity type cladding layer, said second conductivity type cladding layer and said second conductivity type subcladding layer are isolated by said first insulating layer formed on a side of said light waveguide layer and a side of said non-doped layer, and said second insulating layer is formed on another side of said light waveguide layer opposite to said side contacting said first insulating layer. 15. The semiconductor optical function device according to claim 14, wherein said second junction structure part has a homojunction structure which comprises said first conductivity type cladding layer and said second conductivity type sub-cladding layer.
Such an optical modulation device is disclosed, for example, in literature 1: �High-speed InGaAlAs/InAlAs Multiple Quantum Well Optical Modulators with Bandwidths in Excess of 20 GHz at 1.55 μ, Isamu Kotaka, et al, IEEE Photon. Technol. Lett., Vol. 1, No. 5, pp. 100-101, 1989; and in literature 2: �Electro-absorption Modulators on Semi-insulating InP Substrate for High Speed Modulation�, Ajisawa et al., 1990 Institute of Electronic Information and Communication Engineering, Spring National Conference, C-239, p. 4-294.
FIG. 2 is a perspective view depicting a general configuration of an optical modulation element 10 of the electro-absorption type optical modulation device (may be simply called �optical modulation device�) of this embodiment. FIG. 3 is a diagram depicting a cross-section of the element in FIG. 2, when the element is cut along a vertical plane with respect to the light waveguide direction.
The first conductive cladding layer 14 is an n-InP cladding layer with a 2 μm thickness. The light waveguide layer 16 is a non-doped InGaAsP layer, which has a 0.25 μm thickness and a 1.47 μm band gap wavelength. The second conductivity type cladding layer 18 is a p-InP cladding layer with a 1.5 μm thickness. The first junction structure part 20 is a P-i-N junction structure. On the p-InP cladding layer 18 of the first junction structure part 20, a p�InOaAs layer is formed as a first ohmic contact layer 28, which has a 0.2 μm thickness.
The stacked layer body comprising of a part of the n-InP cladding layer 14 of the first junction structure part 20, the non-doped InGaAsP layer 16 and the p-InP cladding layer 18, and the p+-InGaAs layer 28 are processed to have a mesa shape. Both sides of the mesa-shaped part (called the �first mesa part�) are buried by first insulating layers 36 a and 36 b, which are electric insulating layers made of polyimide or Fe-doped InP, for example. That is, a first mesa-shaped part 32 is buried by this electric insulating layer 36 a and 36 bso that light to the light waveguide layer 16 is confined and the electric field is contracted.
The lamination layer body comprising a part of the n-InP cladding layer 14 of the second junction structure part 26, the non-doped InGaAsP layer 22, the p-InP subcladding layer 24, and the p+-InGaAs layer 30 are also processed to have a mesa shape. The side facing the first junction structure part 20 (side facing the first mesa-shaped part 32) of this mesa-shaped part (called the �second mesa-shaped part�) 34 contacts the electric insulating layer 36 a. On the top surfaces of the first insulating layer 36 a and the second insulating layer 36 b, passivation films 38 and 40 with a 0.1 μm thickness are formed, respectively.
The n-InP film 14�, non-doped InGaAsP film 16�, p-InP film 18�, and p+�InGaAs film 28� are epitaxial-grown in this sequence on the Fe-doped lin substrate 12 (FIG. 6A).
On the p+�InGaAs film 28�, SiO2 film is formed. The SiO2 film is patterned so as to remain only in portions which will later be the first mesa-shaped part and the second mesa-shaped part. The remaining part of the SiO2 film becomes a mask for etching 58 (FIG. 6B).
Using this mask for etching 58, dry etching is performed. The (exposed) p+�nGaAs film 28�, the p-InP film 18�, the non-doped lnGaAsP film 16� and a part of the nInP film 14�, where mask 58 is not formed, are removed by dry etching. By this, the first mesa-shaped part 32 and the second mesa-shaped part 34 are formed (FIG. 6C).
The n-InP film, which remains at the first mesa-shaped part 32 and the second mesa-shaped pail 34, becomes the n-InP cladding layer 14. The non-doped InGaAsP layer part, constituting the first mesa-shaped pail 32, becomes the light waveguide layer 16. The remaining part of the p-InP film becomes the p-InP cladding layer 18. The remaining part of the p+�InGaAs film becomes the first ohmic contact layer 28. The remaining part of the non-doped nGaAsP layer, constituting the second mesa-shaped part 34, becomes the non-doped layer 22. The remaining pail of the p-InP film becomes the p-InP sub-cladding layer 24. The remaining part of the p+�InGaAs film becomes the second ohmic contact layer 30 (FIG. 6C). By this, the first mesa-shaped part 32 includes the first junction structure part 20 in FIG. 2. The second mesa-shaped part 34 includes the second junction structure part 26 in FIG. 2.
FIG. 4C shows a third variant form. The n-InP cladding layer 60 is formed on the entire top surface of the substrate 12. A non-doped InGaAsP layer 62� is formed on an area other than the second mesa-shaped part 66 on the top surface of the first conductivity type cladding layer 60. The first insulating layer 36 a, the second insulating layer 36 band the first mesa-shaped part 64 sandwiched therebetween are formed on the top surface of the non-doped InGaAsP layer 62�. Just like the element configuration in FIG. 4A, the first mesa-shaped part 64 comprises the p-InP cladding layer 18 and the first ohmic contact layer 28. The second mesa-shaped part 66 comprises the p-InP sub-cladding layer 24 and the second ohmic contact layer 30, which are directly deposited on the top surface of the n-InP cladding layer 60. The passivation films 38 and 40 are formed respectively on the first insulating layer 36 a and the second insulating layer 36 b. The first electrode 42 is formed on the first ohmic contact layer 28. The second electrode 46 is formed on the second ohmic contact layer 30. The electrode pad 44 is formed on the passivation film 40. The electrode pad 44 is integrated with the first electrode 42 (FIG. 4C).
A first ohmic contact layer 28 is formed on the p-InP cladding layer 18. A second ohmic contact layer 30 is formed on the p-InP sub-cladding layer 24. The first ohmic contact layer 28 and the second ohmic contact layer 30 are p+�InGaAs layers, for example, just like in the first embodiment.
The lamination layer structure of a part of the n-InP cladding layer 14 of the first junction structure pail 20, the non-doped InGaAsP layer 16, the p-InP cladding layer 18 and the p+�lnGaAs layer 28 is processed into a mesa shape, and constitutes a first mesa-shaped part 32. The lamination layer structure of a part of the n-InP cladding layer 14 of the second junction structure pail 26, the non-doped InGaAsP layer 22, the p-lInP sub-cladding layer 24, and the p+�InGaAs layer 30 is also processed to a mesa shape, and constitutes a second mesa-shaped pail 34.
Passivation films 38 and 40 are formed respectively on the top surfaces of the first insulating layer 36 a and the second insulating layer 36 c. A first electrode 42 is formed so as to contact the first ohmic contact layer 28. And continuing from the first electrode 42, an electrode pad 44 is formed on the second insulating layer 36 c via the passivation film 40.
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examinerClassifications U.S. Classification385/2, 385/129, 257/183, 385/3, 385/131, 257/79, 385/1, 385/132, 257/613, 257/458International ClassificationG02F1/025, G02F1/017Cooperative ClassificationB82Y20/00, G02F1/01708European ClassificationB82Y20/00, G02F1/017CLegal EventsDateCodeEventDescriptionDec 29, 2014FPAYFee paymentYear of fee payment: 12Oct 22, 2013ASAssignmentOwner name: LAPIS SEMICONDUCTOR CO., LTD., JAPANFree format text: CHANGE OF NAME;ASSIGNOR:OKI SEMICONDUCTOR CO., LTD.;REEL/FRAME:031627/0671Effective date: 20110823Aug 20, 2013ASAssignmentOwner name: NEOPHOTONICS SEMICONDUCTOR GK, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LAPIS SEMICONDUCTOR CO., LTD.;REEL/FRAME:031040/0194Effective date: 20130329Jan 3, 2011FPAYFee paymentYear of fee payment: 8Mar 5, 2009ASAssignmentOwner name: OKI SEMICONDUCTOR CO., LTD., JAPANFree format text: CHANGE OF NAME;ASSIGNOR:OKI ELECTRIC INDUSTRY CO., LTD.;REEL/FRAME:022399/0969Effective date: 20081001Owner name: OKI 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