1
Kimio Tatsuno, Tatemi Ido, Yasunori Iwafuji, Hideyuki Kuwano, Naohiko Baba: Optical fiber communication equipment and its applied optical systems. Opnext Japan, Mattingly Stanger Malur & Brundidge P C, January 16, 2007: US07164865 (23 worldwide citation)

An object of disclosed technology is to control lasing wavelengths so that a wavelength shift does not occurs. Another object is to permit wavelengths of a light source for wavelength division multiplexing optical-fiber communication system to be variable in response to an ITU-TS grid. A means for a ...


2
Kazuo Yamaguchi, Takashi Minato, Shinzoo Nishiyama, Atsushi Murata, Naohiko Baba, Tsutomu Yoshiya, Kazumi Kawamoto, Kyouichi Yamamoto, Kazuo Aoyama: Method for manufacturing optic transmission modules and system for inspecting bit error rate characters. Hitachi, Antonelli Terry Stout & Kraus, December 9, 2003: US06661503 (22 worldwide citation)

A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with ...


3
Naohiko Baba, Hideyuki Serizawa, Akihiro Hayami, Tadashi Hatano, Yasuhiro Yamada, Norio Chujo: Optical wavelength stability control apparatus, optical transmitter and multiple wavelength transmitter. Hitachi, Mattingly Stanger & Malur P C, May 8, 2001: US06229832 (8 worldwide citation)

An optical transmitter includes a plurality of optical wavelength stability control apparatuses, each of which is capable of compensating for a wavelength drift by varying a laser diode drive current. Each of the optical wavelength stability control apparatuses detects a laser diode drive current, w ...


4
Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba: Driver circuit and optical-transmission module. Opnext Japan, Antonelli Terry Stout & Kraus, December 7, 2004: US06829441 (3 worldwide citation)

A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are ap ...


5
Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba: Driver circuit and optical-transmission module. Hitachi, Antonelli Terry Stout & Kraus, August 12, 2003: US06606177 (2 worldwide citation)

A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are ap ...


6
Mitsuo Akashi, Hiroki Irie, Yasuhiro Yamada, Akihiro Hayami, Naohiko Baba, Tomonao Kikuchi: Optical receiver module optical transmitter module phase-locked loop circuit voltage-controlled oscillator and frequency response controllable amplifier. OpNext Japan, December 31, 2002: US06501583 (2 worldwide citation)

Two sets of a high speed differential amplifier and a low speed differential amplifier are prepared, and frequency response speeds of these high speed/low speed differential amplifiers are different from each other. Both an oscillating frequency and a frequency modulation sensitivity of a ring oscil ...


7
Shigeru Tokita, Mitsuo Akashi, Naohiko Baba, Yoichi Honzawa, Hideki Satoh: Optical transmission device and optical transmission system using the same. OpNext Japan, Townsend and Townsend and Crew, April 18, 2006: US07031620

An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outp ...


8
Shigeru Tokita, Mitsuo Akashi, Naohiko Baba, Yoichi Honzawa, Hideki Satoh: Optical transmission device and optical transmission system using the same. Hitachi, Townsend And Townsend And Crew, May 23, 2002: US20020061035-A1

An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outp ...


9
Norio Chujo, Yoshihiko Hayashi, Akio Osaki, Naohiko Baba: Driver circuit and optical-transmission module. Antonelli Terry Stout & Kraus, October 23, 2003: US20030198479-A1

A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are ap ...


10
Kimio Tatsuno, Tatemi Ido, Yasunori Iwafuji, Hideyuki Kuwano, Naohiko Baba: Optical fiber communication equipment and its applied optical systems. Mattingly Stanger & Malur PC, May 2, 2002: US20020051270-A1

An object of disclosed technology is to control lasing wavelengths so that a wavelength shift does not occurs. Another object is to permit wavelengths of a light source for wavelength division multiplexing optical-fiber communication system to be variable in response to an ITU-TS grid. A means for a ...