Patents Assigned to Tecdia Co., Ltd.
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Publication number: 20090154506Abstract: The objective of the present invention is to provide with is to provide with a tunable laser module capable of adequately detecting the decay of the large variation in the wavelength of the light and then operating the shutter. The tunable laser module 1 comprises a tunable laser source 11˜13 capable of emitting light with a wavelength defined by wavelength control signal, and following controllers 14˜17, 18˜23, 24˜28. A temperature controller 14˜17 operates to perform the control of the temperature of the tunable laser source 11˜13. A wavelength controller 18˜23 operates to perform the control of the wavelength of the light emanating from the tunable laser source 11˜13. A power controller 24˜28 operates to perform the control of the power of the tunable laser source 11˜13.Type: ApplicationFiled: July 11, 2008Publication date: June 18, 2009Applicant: TECDIA CO., LTD.Inventors: Etsuo Koyama, Yasuo Nagai
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Publication number: 20090154921Abstract: The objective of the present invention is to provide with control system and method for optical communication device application, the system and the method cooperatively controlling software and an optical device controller (hardware) contributing a plurality of loops, at least one of which having a singularity more than first order. In order to achieve the objective, the present invention provide with the following configuration. CPU performs the temperature control task as the highest priority task, and the others as lower priority tasks: such as the wavelength control task, the laser output level control task and other kind of tasks 4˜n. Service functions, which notify event, information, and so on to a client, are provided with as programs in order to message, for example the control task things, to the RTOS. There are three states as those of task, i.e.Type: ApplicationFiled: August 18, 2008Publication date: June 18, 2009Applicant: TECDIA CO., LTD.Inventors: Etsuo Koyama, Yasuo Nagai
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Publication number: 20090141748Abstract: The objective of the present invention is to provide with a tunable laser light source and controlling method of the same capable of detecting the degree of out-of-tune-ness, maintaining simple configuration. The tunable laser light source comprises a gain medium 1, a tunable band rejector 2, an etalon 3, and a transmitted light detector 4. The gain medium 1 is capable of amplifying light within a wavelength band including a target wavelength. The a tunable band rejector 2 is positioned opposite the gain medium thereby forming an edge of a laser resonator and is capable of rejecting light with a certain wavelength tunable to the target wavelength from the incident light emanating from the gain medium while transmitting the remaining. The an etalon 3 is positioned between the gain medium and the tunable band rejector and is capable of selectively transmitting light with certain wavelengths including the target wavelength.Type: ApplicationFiled: July 11, 2008Publication date: June 4, 2009Applicant: TECDIA CO., LTD.Inventors: Etsuo Koyama, Yasuo Nagai
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Publication number: 20090140278Abstract: The objective of the invention is to provide with a tunable LED module capable of easily selecting a wavelength and reducing particular parts, comparing to that of prior art. The tunable LED module according to the present invention is applicable to a certain short range communication.Type: ApplicationFiled: July 11, 2008Publication date: June 4, 2009Applicant: TECDIA CO., LTD.Inventors: Etsuo Koyama, Yasuo Nagai
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Patent number: 7387452Abstract: The object of the present invention is to provide a semiconductor laser module capable of reducing the burdens for the arrangement of the optical system than the conventional one. The semiconductor laser module comprises: a semiconductor laser 1 for emitting, as a transmitted light, a light with a wavelength within a certain communication wavelength band such as, for example, 1.3 .mu.Type: GrantFiled: March 12, 2007Date of Patent: June 17, 2008Assignee: Tecdia Co., Ltd.Inventors: Etsuo Koyama, Hiroyoshi Matsumura, Shojiro Hayashi
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Publication number: 20080089643Abstract: The object of the present invention is to provide a semiconductor laser module capable of reducing the burdens for the arrangement of the optical system than the conventional one. The semiconductor laser module comprises: a semiconductor laser 1 for emitting, as a transmitted light, a light with a wavelength within a certain communication wavelength band such as, for example, 1.3 .mu.Type: ApplicationFiled: March 12, 2007Publication date: April 17, 2008Applicant: Tecdia Co., Ltd.Inventors: Etsuo Koyama, Hiroyoshi Matsumura, Shojiro Hayashi
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Patent number: 7343064Abstract: To provide a wavelength-selection optical switch able to select a light with a certain wavelength and an optical add/drop multiplexer using the same. An optical switch comprising: a silicon substrate; a glass substrate arranged to face a surface of the silicon substrate and having a transparent electrode layer in its opposing surface; a light diffraction reflection layer aligned on a surface of the silicon substrate; a liquid crystal layer aligned between the light diffraction reflection layer and the transparent electrode layer; a silicon substrate electrical terminal extracted from a rear surface of the silicon substrate; and a means for applying voltage between the transparent electrode layer and the silicon substrate electrical terminal; wherein selection of wavelength of light diffracted and reflected by the light diffraction reflection layer is possible by controlling the refraction index of the liquid crystal layer through the voltage.Type: GrantFiled: October 2, 2006Date of Patent: March 11, 2008Assignee: Tecdia Co., Ltd.Inventors: Etsuo Koyama, Hiroyoshi Matsumura
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Publication number: 20070211987Abstract: To provide with a wavelength-selection optical switch able to select a light with a certain wavelength and an optical add/drop multiplexer using the same. An optical switch comprising: a silicon substrate; a glass substrate arranged to face a surface of the silicon substrate and having a transparent electrode layer in its opposing surface; a light diffraction reflection layer aligned on a surface of the silicon substrate; a liquid crystal layer aligned between the light diffraction reflection layer and the transparent electrode layer; a silicon substrate electrical terminal extracted from a rear surface of the silicon substrate; and a means for applying voltage between the transparent electrode layer and the silicon substrate electrical terminal; wherein selection of wavelength of light diffracted and reflected by the light diffraction reflection layer is possible by controlling the refraction index of the liquid crystal layer through the voltage.Type: ApplicationFiled: October 2, 2006Publication date: September 13, 2007Applicant: Tecdia Co., Ltd.Inventors: Etsuo Koyama, Hiroyoshi Matsumura
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Publication number: 20070177637Abstract: In order to reduce the sizes of a tunable optical filter and an external-resonator-type tunable semiconductor laser device, the filter includes: a silicon substrate; a glass substrate which is disposed opposed to the face of the silicon substrate and is equipped with a transparent electrode layer provided over the face thereof disposed to the substrate; an optical diffracting-and-reflecting layer disposed over the face of the silicon substrate; and a liquid crystal layer disposed between the optical diffracting-and-reflecting layer and the transparent electrode layer; and the filter is characterized in that in the filter where the refractive index of the liquid crystal layer is controlled by the voltage applied between the silicon substrate and the transparent electrode layer, a silicon-substrate-side electrode terminal for applying the voltage thereto is provided on the backside of the silicon substrate, this filter being assembled in the external-resonator-type tunable semiconductor laser device.Type: ApplicationFiled: September 6, 2006Publication date: August 2, 2007Applicant: Tecdia Co., Ltd.Inventors: Etsuo Koyama, Hiroyoshi Matsumura