Patents by Inventor Ju-Chang Han

Ju-Chang Han has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7305165
    Abstract: An optical fiber for use in a metro network is provided. The optical fiber has a loss of 0.25 dB/km or less in the C-band and the L-band, a zero dispersion wavelength between 1560 nm and 1560 nm, and a dispersion slope of at least 0.074 ps/nm2/km at a wavelength of 1550 nm.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: December 4, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ju-Chang Han, Sung-Koog Oh, Yun-Geun Jang
  • Patent number: 7120341
    Abstract: An optical fiber for long-distance optical communication networks has a zero dispersion wavelength value in the range of 1560 to 1570 nm and a dispersion gradient value, at a wavelength band of 1550 nm, in the range of 0.055 to 0.075 ps/nm2/km.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: October 10, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Koog Oh, Ju-Chang Han, Yun-Geun Jang
  • Patent number: 7116876
    Abstract: An optical fiber for an optical network is disclosed. The optical fiber includes a core having a core region having a first refractive index N1, and a refractive index depressed region surrounding the core region and having a second refractive index N2 that is lower than the first refractive index. A clad surrounds the core and having a third refractive index N4. The optical fiber has a zero-dispersion wavelength that is not less than 1555 nm and positioned in a wavelength range which does not exceed L-band. The optical fiber has negative dispersion values in C-band and positive dispersion values in L-band.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: October 3, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yun-Geun Jang, Sung-Koog Oh, Ju-Chang Han
  • Patent number: 7003205
    Abstract: Disclosed is a wide-band dispersion controlled optical fiber. The optical fiber enables the use of optical signals in various wavelength regions in a wavelength division multiplexing mode communication network by controlling the position of the zero dispersion wavelength, and enables long distance transmission by controlling dispersion slope and bending loss. Furthermore, there is an advantage in that the optical fiber enables not only short distance transmission but also middle/long distance transmission using a single type of optical fiber because the optical fiber is controlled to have negative dispersion values in the O-band wavelength region and positive dispersion values with small deviations in the C-band and L-band wavelength regions.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: February 21, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jeong-Sik Cho, Mun-Hyun Do, Jin-Seong Yang, Sang-Ho Cha, Ju-Chang Han, Yun-Geun Jang, Ki-Moon Kwak
  • Patent number: 6999667
    Abstract: Disclosed is an optical fiber comprising a center core which forms a passageway for transmitting optical signals and has a refractive index N1, and a cladding which encloses the center core and has a refractive index N0. The optical fiber further comprises an upper core, which has a distribution of refractive indices increased starting from a refractive index N2 (>N0) at its outer circumference to the refractive index N1 at its internal circumference, and a minutely depressed refractive index region, which is interposed between said upper core and cladding and has a refractive index N3. The refractive index N3 is lower than the refractive index N0.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: February 14, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yun-Geun Jang, Mun-Hyun Do, Sung-Wook Choi, Ju-Chang Han, Jeong-Sik Cho, Jin-Seong Yang
  • Publication number: 20050265676
    Abstract: An optical fiber for use in a metro network is provided. The optical fiber has a loss of 0.25 dB/km or less in the C-band and the L-band, a zero dispersion wavelength between 1560 nm and 1560 nm, and a dispersion slope of at least 0.074 ps/nm2/km at a wavelength of 1550 nm.
    Type: Application
    Filed: October 13, 2004
    Publication date: December 1, 2005
    Inventors: Ju-Chang Han, Sung-Koog Oh, Yun-Geun Jang
  • Publication number: 20050254766
    Abstract: An optical fiber for long-distance optical communication networks has a zero dispersion wavelength value in the range of 1560 to 1570 nm and a dispersion gradient value, at a wavelength band of 1550 nm, in the range of 0.055 to 0.075 ps/nm2/km.
    Type: Application
    Filed: October 13, 2004
    Publication date: November 17, 2005
    Inventors: Sung-Koog Oh, Ju-Chang Han, Yun-Geun Jang
  • Publication number: 20050175303
    Abstract: An optical fiber for an optical network is disclosed. The optical fiber includes a core having a core region having a first refractive index N1, and a refractive index depressed region surrounding the core region and having a second refractive index N2 that is lower than the first refractive index. A clad surrounds the core and having a third refractive index N4. The optical fiber has a zero-dispersion wavelength that is not less than 1555 nm and positioned in a wavelength range which does not exceed L-band. The optical fiber has negative dispersion values in C-band and positive dispersion values in L-band.
    Type: Application
    Filed: August 13, 2004
    Publication date: August 11, 2005
    Inventors: Yun-Geun Jang, Sung-Koog Oh, Ju-Chang Han
  • Publication number: 20040141705
    Abstract: Disclosed is a wide-band dispersion controlled optical fiber. The optical fiber enables the use of optical signals in various wavelength regions in a wavelength division multiplexing mode communication network by controlling the position of the zero dispersion wavelength, and enables long distance transmission by controlling dispersion slope and bending loss. Furthermore, there is an advantage in that the optical fiber enables not only short distance transmission but also middle/long distance transmission using a single type of optical fiber because the optical fiber is controlled to have negative dispersion values in the O-band wavelength region and positive dispersion values with small deviations in the C-band and L-band wavelength regions.
    Type: Application
    Filed: August 5, 2003
    Publication date: July 22, 2004
    Inventors: Jeong-Sik Cho, Mun-Hyun Do, Jin-Seong Yang, Sang-Ho Cha, Ju-Chang Han, Yun-Geun Jang, Ki-Moon Kwak
  • Publication number: 20030190128
    Abstract: Disclosed is an optical fiber comprising a center core which forms a passageway for transmitting optical signals and has a refractive index N1, and a cladding which encloses the center core and has a refractive index N0. The optical fiber further comprises an upper core, which has a distribution of refractive indices increased starting from a refractive index N2 (>N0) at its outer circumference to the refractive index N1 at its internal circumference, and a minutely depressed refractive index region, which is interposed between said upper core and cladding and has a refractive index N3. The refractive index N3 is lower than the refractive index N0.
    Type: Application
    Filed: March 19, 2003
    Publication date: October 9, 2003
    Inventors: Yun-Geun Jang, Mun-Hyun Do, Sung-Wook Choi, Ju-Chang Han, Jeong-Sik Cho, Jin-Seong Yang