1
Byoung Whi Kim, Han Hyub Lee, Jie Hyun Lee, Bong Tae Kim: Wavelength division multiplexing-passive optical network system. Electronics and Telecommunications Research Institute, Rabin & Berdo P C, April 14, 2015: US09008513 (121 worldwide citation)

The present invention proposes a wavelength division multiplexing-passive optical network (WDM-PON) system which transmits downstream data to an optical network unit (ONU) as an optical line termination (OLT) receives seed light from a spectrum-sliced external light source module. One characteristic ...


2
Patrick Paul Iannone, Han Hyub Lee, Kenneth Charles Reichmann, Xiang Zhou: Method and apparatus for enabling multiple optical line termination devices to share a feeder fiber. AT&T Intellectual Property II, August 7, 2012: US08238751 (7 worldwide citation)

A method and apparatus for enabling multiple optical line termination (OLT) devices to share a feeder fiber are disclosed. For example, the optical network comprises a plurality of optical line termination (OLT) devices, where each OLT device having a transceiver for sending and receiving optical si ...


3
Patrick Paul Iannone, Han Hyub Lee, Kenneth Charles Reichmann, Xiang Zhou: Method and apparatus for enabling multiple passive optical networks to share one or more sources. AT&T Intellectual Property II, July 17, 2012: US08224183 (6 worldwide citation)

A method and apparatus for implementing a hybrid SOA-Raman amplifier in a central office in order to enable multiple passive optical networks to share one or more enhancement service sources, e.g., to share a source for a broadcast service are disclosed.


4
Patrick Paul Iannone, Han Hyub Lee, Kenneth Charles Reichmann, Xiang Zhou: Method and apparatus for providing passive optical networks with extended reach and/or split. AT&T Intellectual Property II, April 15, 2014: US08699881 (5 worldwide citation)

A method and apparatus for providing passive optical networks with extended reach and/or splitting ratio are disclosed. For example, the optical network comprises a first optical line termination (OLT) device having a transceiver for sending and receiving optical signals. The optical network further ...


5
Han hyub Lee, Byoung whi Kim, Jea hoon Yu, Mahn Yong Park, Jai sang Koh: Seed light module for passive optical network. Electronics and Telecommunications Research Institute, Blakely Sokoloff Taylor & Zafman, April 16, 2013: US08422124 (3 worldwide citation)

A spectrum-sliced seed light module for a wavelength division multiplexing passive optical network (WDM PON) is provided. The seed light module includes an optical amplifier to amplify seed light, an optical wavelength filter to transmit broadband light, which is output in opposite direction to an o ...


6
Byoung Whi Kim, Han Hyub Lee, Bong Tae Kim: Time division multiple access over wavelength division multiplexed passive optical network. Electronics and Telecommunications Research Institute, Ladas & Parry, July 16, 2013: US08488977 (3 worldwide citation)

Provided is a time division multiple access over wavelength division multiplexed passive optical network (TDM-over-WDM-PON) system. According to the TDM-over-WDM-PON system, a downstream optical signal is separated according to a wavelength in a remote node, transmitted to an optical amplifying devi ...


7
Han Hyub Lee, Sang Soo Lee: Time and wavelength division multiplexing—passive optical network (TWDM-PON) system and communication link method thereof. ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Rabin & Berdo P C, September 15, 2015: US09136968 (2 worldwide citation)

A Time Wavelength Division Multiplexing-Passive Optical Network (TWDM-PON) system and a communication link method thereof are provided. The communication link method is a method whereby an Optical Network Unit (ONU) which has established communication link to one Optical Line Terminal (OLT) establis ...


8
Patrick Paul Iannone, Han Hyub Lee, Kenneth Charles Reichmann, Xiang Zhou: Method and apparatus for enabling multiple optical line termination devices to share a feeder fiber. AT&T Intellectual Property II, January 7, 2014: US08625992 (1 worldwide citation)

A method and apparatus for enabling multiple optical line termination (OLT) devices to share a feeder fiber are disclosed. For example, the optical network comprises a plurality of optical line termination (OLT) devices, where each OLT device having a transceiver for sending and receiving optical si ...


9
Han Hyub Lee, Donghan Lee, Hee Sang Chung, Kwangjoon Kim: Optical transmission line monitoring system using a gain clamped optical amplifier. Electronics and Telecommunications Research Institute, Blakely Sokoloff Taylor & Zafman, October 21, 2008: US07440695 (1 worldwide citation)

There are provided a method and system for monitoring an optical transmission line. The system for monitoring the optical transmission line includes: an OTDR (optical time-domain reflectometer) transmitting a monitoring light to an optical transmission line, measuring a reflected light or backscatte ...


10
Jie Hyun Lee, Seung II Myong, Han Hyub Lee, Sang Soo Lee: Wavelength tuning time measurement apparatus and method for multi-wavelength passive optical network. ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Rabin & Berdo P C, August 18, 2015: US09112600 (1 worldwide citation)

A wavelength tuning time measurement apparatus and method for a multi-wavelength passive optical network (MW PON) are provided. The wavelength tuning time measurement apparatus for measuring a wavelength tuning time of a wavelength-variable light source included in the MW PON system includes an opti ...