# US 2014/0153859 A1 · Optical modulator and optical transmitter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153859 A1 - Document ID: US20140153859A1 - Status: Published application - Kind: A1 - Application number: 14/062,224 - Filed: 2013-10-24 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Suguru Akiyama; Takeshi Baba - Web page: https://patentgrep.com/patent/US20140153859A1 ## CPC - G02F 1/025: in an optical waveguide structure (G02F1/017, {G02F1/2257} take precedence) - G02F 1/2257: {the optical waveguides being made of semiconducting material} - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract The present optical modulator includes an optical waveguide core made of a semiconductor material, an electrode, and a plurality of channels made of a semiconductor material doped in an n type or a p type and electrically connecting the optical waveguide core and the electrode to each other. The plurality of channels are provided in a spaced relationship from each other along a propagation direction of light; the optical waveguide core includes a doped region doped in the n type or the p type and a non-doped region. The doped region and the non-doped region are disposed alternately along the propagation direction of light. Each of the plurality of channels is connected to the doped region. ## Claims ### Claim 1 An optical modulator comprising: an optical waveguide core made of a semiconductor material; an electrode; and a plurality of channels made of a semiconductor material doped in an n type or a p type and electrically connecting the optical waveguide core and the electrode to each other; wherein the plurality of channels are provided in a spaced relationship from each other along a propagation direction of light; the optical waveguide core includes a doped region doped in the n type or the p type and a non-doped region, the doped region and the non-doped region being disposed alternately along the propagation direction of light; and each of the plurality of channels is connected to the doped region. ### Claim 2 (depends on 1) The optical modulator according to claim 1, wherein the plurality of channels are provided periodically in a fixedly spaced relationship from each other in the propagation direction of light. ### Claim 3 (depends on 1) The optical modulator according to claim 1, wherein the electrode includes a first electrode and a second electrode provided on opposite sides of the optical waveguide core; the doped region includes an n-type doped region doped in the n type, and a p-type doped region joined to the n type doped region and doped in the p type; the non-doped region and at least one of the n-type doped region and the p-type doped region are provided alternately along the propagation direction of light; and the plurality of channels include a plurality of n-type channels made of a semiconductor material doped in the n type, electrically connecting the optical waveguide core and the first electrode to each other, provided in a spaced relationship from each other in the propagation direction of light and connected to the n-type doped region, and a plurality of p-type channels made of a semiconductor material doped in the p type, electrically connecting the optical waveguide core and the second electrode to each other, provided in a spaced relationship from each other in the propagation direction of light and connected to the p-type doped region. ### Claim 4 (depends on 3) The optical modulator according to claim 3, wherein the n-type doped region and the non-doped region are provided alternately along the propagation direction of light, and the p-type doped region and the non-doped region are provided alternately along the propagation direction of light. ### Claim 5 (depends on 3) The optical modulator according to claim 3, wherein the n-type doped region and the non-doped region are provided alternately along the propagation direction of light, and the p-type doped region is provided successively along the propagation direction of light. ### Claim 6 (depends on 3) The optical modulator according to claim 3, wherein the p-type doped region and the non-doped region are provided alternately along the propagation direction of light, and the n-type doped region is provided successively along the propagation direction of light. ### Claim 7 (depends on 3) The optical modulator according to claim 3, wherein the plurality of n-type channels are provided periodically in a fixedly spaced relationship from each other along the propagation direction of light, and the plurality of p-type channels are provided periodically in a fixedly spaced relationship from each other along the propagation direction of light. ### Claim 8 (depends on 1) The optical modulator according to claim 1, wherein the electrode includes a first electrode and a second electrode provided on opposite sides of the optical waveguide core; the doped region includes a p-type doped region doped in the p type; and the plurality of channels include a plurality of first n-type channels made of a semiconductor material doped in the n type, electrically connecting the optical waveguide core and the first electrode to each other, provided in a spaced relationship from each other in the propagation direction of light and connected to one side of the doped region, and a plurality of second n-type channels made of a semiconductor material doped in the n type, electrically connecting the optical waveguide core and the second electrode to each other, provided in a spaced relationship from each other in the propagation direction of light and connected to the opposite side to the one side of the doped regions. ### Claim 9 (depends on 8) The optical modulator according to claim 8, wherein the plurality of first n-type channels are provided periodically in a fixedly spaced relationship from each other in the propagation direction of light, and the plurality of second n-type channels are provided periodically in a fixedly spaced relationship from each other in the propagation direction of light. ### Claim 10 (depends on 1) The optical modulator according to claim 1, wherein the optical waveguide core and the plurality of channels have an equal thickness. ### Claim 11 An optical transmitter, comprising: a semiconductor laser that outputs continuous light; and an optical modulator that modulates the continuous light from the semiconductor laser; the optical modulator including: an optical waveguide core made of a semiconductor material; an electrode; and a plurality of channels made of a semiconductor material doped in an n type or a p type and electrically connecting the optical waveguide core and the electrode to each other; the plurality of channels being provided in a spaced relationship from each other along a propagation direction of light; the optical waveguide core including a doped region doped in the n type or the p type and a non-doped region, the doped region and the non-doped region being disposed alternately along the propagation direction of light; and each of the plurality of channels being connected to the doped region; the plurality of channels being provided periodically in a fixedly spaced relationship from each other in the propagation direction of light; a wavelength of the continuous light outputted from the semiconductor laser being set to a wavelength in the proximity of a band edge on the longer wavelength side of a stop band of a transmission spectrum of the optical modulator.