| Patent Number |
Title Of Patent |
Date Issued |
| 7398021 |
Optical transmitter and passive optical network using the same |
July 8, 2008 |
| An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and a third port, the circulator receiving the injection light at the first port, and outp |
| 7386239 |
Chirped RZ-AMI optical transmitter |
June 10, 2008 |
| A chirped RZ-AMI optical transmitter includes a first logic gate for receiving a first signal obtained by pre-coding binary data and a second signal having a waveform obtained by inverting and delaying the first signal, and outputting a third signal obtained by logically operating on |
| 7375700 |
Wideband monopole antenna |
May 20, 2008 |
| A wideband monopole antenna assembly includes a substrate having an antenna connector, a wideband monopole antenna positioned on the substrate, and a feeder unit positioned on the rear surface of the substrate for supporting the antenna with a part thereof bent at a predetermined ang |
| 7369588 |
Broad-band optical semiconductor device and a method for manufacturing the same |
May 6, 2008 |
| Disclosed is an optical semiconductor device that provides an optical gain or optical loss depending on application of electric current. The optical semiconductor device comprises: a lower clad layer; an active layer disposed on the lower clad layer, the active layer generating optical |
| 7362978 |
Duobinary optical transmission apparatus |
April 22, 2008 |
| Disclosed is a duobinary optical transmission apparatus. The duobinary optical transmission apparatus uses the crossed phase characteristics of a duobinary signal without using a feedback-type precoder and an electric LPF, and is thereby not affected by Pseudo-Random Bit Sequence (PRBS), |
| 7359638 |
Optical source generator for wavelength division multiplexing optical communication systems |
April 15, 2008 |
| An optical source generator for wavelength-division-multiplexing optical communication systems includes a wavelength-division multiplexer/demultiplexer, optical amplifiers, and wavelength-dependent reflectors such as optical fiber-Bragg gratings or wavelength-independent reflectors s |
| 7355785 |
Gain-clamped semiconductor optical amplifier |
April 8, 2008 |
| A gain-clamped semiconductor optical amplifier is disclosed. The amplifier includes a gain waveguide for amplifying an optical signal input to the gain waveguide, and a grating layer, in contact with the gain waveguide, having a first grating disposed at a first end portion. |
| 7340173 |
Wavelength division multiplexing optical transmitter using Fabry-Perot laser |
March 4, 2008 |
| A WDM (Wavelength Division Multiplexing) optical transmitter using a Fabry-Perot laser is disclosed. The WDM optical transmitter includes a light source for outputting incoherent light of a prescribed wavelength bandwidth, a circulator having the first to the third ports, for outputt |
| 7340170 |
Wavelength-division multiplexed self-healing passive optical network |
March 4, 2008 |
| A wavelength-division multiplexed self-healing passive optical network is capable of detecting cut-off and deterioration of feeder fiber and distribution fiber and restoring a network with a star structure. The network includes a central office, a remote node, and a plurality of subs |
| 7319818 |
Wavelength-division-multiplexed passive optical network using wavelength-locked optical transmit |
January 15, 2008 |
| Disclosed is a wavelength-division-multiplexed passive optical network using a wavelength-locked optical transmitter. The wavelength-division-multiplexed passive optical network (WDM PON) includes a central office, which includes a plurality of downstream optical transmitters for out |
| 7319707 |
L-band light source |
January 15, 2008 |
| An L-band light source is provided that has improved amplifying efficiency and stabilized output power. The L-band light source comprises: a gain medium having first and second sides, and configured to generate an L-band amplified spontaneous emission (ASE); a first pump light source to |
| 7310481 |
WDM-PON having bus structure |
December 18, 2007 |
| Disclosure is a wavelength division multiplexed-passive optical network having a bus structure capable of connecting one central office to a plurality of remote nodes through one optical fiber. The wavelength division multiplexed-passive optical network (WDM-PON) having a bus structu |
| 7295778 |
Wavelength division multiplexed passive optical network system |
November 13, 2007 |
| Disclosed is a wavelength division multiplexed passive optical network (WDM PON) system including a central office, a remote Node, and an optical fiber coupled between the central office and the remote node, wherein the central office includes an optical power splitter coupled to the |
| 7289048 |
Duo-binary encoder and optical duo-binary transmission apparatus using the same |
October 30, 2007 |
| A duo-binary encoder performs a parallel processing and an optical duo-binary transmission apparatus using the encoder to enhance transmission capability. The duo-binary encoder has a judgment unit for judging whether an odd number or even number of `0`s exists in data input signals |
| 7283748 |
Self-healing wavelength division multiplexing-passive optical network system |
October 16, 2007 |
| A self-healing WDM (Wavelength Division Multiplexing)-PON (Passive Optical Network) system is disclosed and includes a CO (Central Office), a RN (Remote Node) and a plurality of subscriber units. The system includes a trunk working fiber and a trunk protection fiber for connecting the CO |
| 7280719 |
Wideband optical module and PON using the same |
October 9, 2007 |
| A wideband optical module includes a downward wideband light source for generating downward light, an upward wideband light source for generating upward light, a first circulator including a first to a third port for outputting multiplexed downward optical signals to the second port and |
| 7277646 |
Duobinary optical transmitter |
October 2, 2007 |
| An optical transmitter for generating an optical signal includes: a precoder for coding an electrical signal of binary data; a continuous-wave (CW) light source for generating a continuous wave light; an optical phase modulator for modulating the phase of an optical signal outputted |
| 7277639 |
Bi-directional optical add/drop multiplexer for WDM optical networks |
October 2, 2007 |
| Disclosed is a bi-directional optical add/drop multiplexer connected to an optical fiber for transmitting optical signals multiplexed in a wavelength division multiplexing optical network and which performs adding/dropping of the optical signals. The optical add/drop multiplexer incl |
| 7271949 |
Multi-wavelength light source and wavelength division multiplexing system using the same |
September 18, 2007 |
| A multi-wavelength light source includes an amplifier for generating light over a wide wavelength range; and, an optical fiber grating including a plurality of gratings formed on an optical fiber in in parallel with each other, thereby dividing the light inputted from the amplifier into |
| 7269352 |
Wavelength division multiplexing light source apparatus using semiconductor optical amplifier |
September 11, 2007 |
| A WDM (Wavelength Division Multiplexing) light source apparatus using a SOA (Semiconductor Optical Amplifier) is disclosed. The WDM light source apparatus includes N SOAs, a 1.times.N multiplexer/demultiplexer, and a reflective mirror. The N SOAs have one end coated with a substance of a |
| 7269311 |
Remote antenna unit and wavelength division multiplexing radio-over-fiber network |
September 11, 2007 |
| Disclosed is a remote antenna unit and a wavelength division multiplexing network. The remote antenna unit includes: an optical circulator having a plurality of ports; an electric field absorption modulator having a first input/output end and a second reflective end, the electric field |
| 7266300 |
BPSR optical transmission node |
September 4, 2007 |
| A bi-directional path switched ring optical transmission node has simple configuration which reduces the influence of a wave reflected by an obstacle on optical line.The BPSR optical transmission node connects to a first optical line through which an odd channel signal and an even ch |
| 7257330 |
Duobinary optical transmission apparatus using a semiconductor optical amplifier |
August 14, 2007 |
| Disclosed is a duobinary optical transmission apparatus using a semiconductor optical amplifier (SOA). The duobinary optical transmission apparatus includes a light source for generating a carrier wave; a duobinary precoder for encoding an input (non return to zero) electric signal; |
| 7254344 |
Passive optical network using loop back of multi-wavelength light generated at central office |
August 7, 2007 |
| A passive optical network includes a central office and a subscriber-side apparatus connected with the central office through an optical fiber link. The subscriber-side apparatus performs communication with the central office based on wavelength-division-multiplexed optical signals. |
| 7254340 |
Apparatus and method for tracking optical wavelength in WDM passive optical network using loop-b |
August 7, 2007 |
| An optical wavelength tracking apparatus and method in a wavelength division multiplexed (WDM) passive optical network (PON) in which a central office (CO) having a multi-frequency light source is connected to a plurality of optical network units (ONUs) having loop-back light sources |
| 7236295 |
Broadband light source |
June 26, 2007 |
| A broadband light source is disclosed. The broadband light source includes a semiconductor optical amplifier for generating and amplifying light of a broadband wavelength, the amplifier having a first end and a second end and a mirror spaced from the second end of the semiconductor optic |
| 7231149 |
Bidirectional optical add-drop multiplexer |
June 12, 2007 |
| A bidirectional optical add-drop multiplexer adds and drops optical signals having specific wavelengths among the WDM optical signals transmitted bidirectionally through one of the optical transmission lines connected between neighbor nodes in a bidirectional WDM ring network. |
| 7228021 |
Bidirectional optical add/drop multiplexer and wavelength division multiplexed ring network usin |
June 5, 2007 |
| Disclosed is a bidirectional optical add/drop multiplexer that includes a first filter for reflecting a first optical signal pre-selected among input forward optical signals and transmitting the remaining forward optical signals, a second filter for reflecting a second optical signal |
| 7224907 |
Duobinary optical transmission apparatus |
May 29, 2007 |
| A duobinary optical transmission apparatus is provided to generate duobinary optical signals, without using an electric low-pass-filter (LPF), by restricting a bandwidth of a Mach-Zehnder-interferometer-type optical intensity modulator (MZ MOD). Alternatively, a LPF having a single p |
| 7224519 |
Low noise multi-wavelength light source and wavelength division multiplexing system using same |
May 29, 2007 |
| A multi-wavelength light source includes a substrate, a fabry-perot laser laminated on the substrate that is operated by driving current below a predetermined threshold current to generate multi-wavelength light including a plurality of peaks whose wavelengths and spacing are identic |
| 7224506 |
Single side band modulation device |
May 29, 2007 |
| A single side band modulation device includes a first Mach Zehnder interferometer and a second Mach Zehnder interferometer. The first Mach Zehnder interferometer includes at least two output arms, and the second Mach Zehnder interferometer includes at least two output arms. Terminals |
| 7215892 |
Duobinary optical transmitter |
May 8, 2007 |
| Disclosed is a duobinary optical transmitter, which includes a laser source for outputting light with a predetermined wavelength; a Mach-Zehnder interferometer-type optical intensity modulator for modulating the intensity of the light according to a three-level data signal inputted t |
| 7212691 |
Polarization-shaped duobinary optical transmission apparatus |
May 1, 2007 |
| A polarization-shaped duobinary optical transmission apparatus is disclosed. The apparatus includes a light source that generates light having a continuous wave, an optical intensity modulator that converts the light into an optical intensity signal based upon an input electric signa |
| 7209609 |
Light source apparatus for WDM optical communication and optical communication system |
April 24, 2007 |
| A light source apparatus for use with optical communication using external-injection light sources, and an optical communication system using the light source apparatus. The light source apparatus for optical communication includes external-injection light sources, and a multiplexer/ |
| 7209508 |
Multi-channel light source and multi-channel optical module using the same |
April 24, 2007 |
| A multi-channel light source includes a semiconductor optical amplifier for generating light of a wide wavelength band and outputting the generated light through a first end and a second end. The source further includes a Fabry-Perot (FP) resonator for resonating the light inputted f |
| 7206519 |
Duobinary optical transmission apparatus |
April 17, 2007 |
| Disclosed is a duobinary optical transmission apparatus. The duobinary optical transmission apparatusenhances nonlinear and dispersion characteristics for an intermediate-long distance transmission at a high-speed transfer rate without the use an electric LPF. The duobinary optical t |
| 7193539 |
Precoder and optical duo-binary transmission apparatus using the same |
March 20, 2007 |
| A precoder for an optical duo-binary transmission apparatus disposing the precoder before a time division multiplexer includes a judgment unit for judging whether an odd number or even number of `1`s exist in data input signals of N channels inputted at an n.sup.th time of channel input. |
| 7190510 |
Metro wavelength division multiplexing network |
March 13, 2007 |
| A metro wavelength division multiplexing network is disclosed and includes a plurality of optical repeaters connected to each other through an optical fiber link, wherein each of the optical repeaters includes a Raman gain medium for Raman-amplifying inputted optical signals, an ampl |
| 7187700 |
Method for maintaining wavelength-locking of Fabry-Perot laser regardless of change of external |
March 6, 2007 |
| Disclosed is a method for maintaining wavelength-locking of a Fabry-Perot laser regardless of a change of external temperature even though a temperature controller is not used, and a wavelength division multiplexing (WDM) light source using the method, as an economical light source u |
| 7174104 |
Transmitting apparatus using multiple lambda source in WDM network |
February 6, 2007 |
| A transmitting apparatus using a multiple lambda source in WDM network, which has an improved structure to minimize costs and efforts and reduce time delay that may be incurred through wavelength shift. The transmitting apparatus comprises: a multiple lambda source providing a signal |
| 7174102 |
Bi-directional wavelength division multiplexing self-healing passive optical network |
February 6, 2007 |
| Disclosed is a bi-directional wavelength division multiplexing self-healing passive optical network including: a central office for multiplexing and transmitting downstream optical signals to a first and a second main fiber; a remote node connected to the central office through the f |
| 7173758 |
Gain-clamped semiconductor optical amplifier |
February 6, 2007 |
| A gain-clamped semiconductor optical amplifier includes a semiconductor optical amplifier for amplifying an inputted optical signal and outputting amplified spontaneous emission light, the amplified spontaneous emission light consisting of a first portion and a second portion, the fi |
| 7173757 |
Broad-band light source using a semiconductor optical amplifier |
February 6, 2007 |
| A broad-band light source using a semiconductor optical amplifier is provided. The broad-band light source includes the semiconductor optical amplifier including an active layer serving as a gain area, an under-cladding layer, an over-cladding layer, and antireflection layers formed |
| 7136218 |
Raman optical amplifier |
November 14, 2006 |
| A Raman optical amplifier includes a fiber amplifier for Raman-amplifying an input optical signal to form a primarily-amplified optical signal, and a semiconductor optical amplifier for outputting a Raman pumping light of a predetermined wavelength adapted to Raman-pump the fiber amplifi |
| 7123633 |
Method for maintaining mode-locked state of fabry-perot laser irrespective of temperature change |
October 17, 2006 |
| A method for maintaining the mode-locked state of a Fabry-Perot (FP) laser and a WDM light source using the same method for use in WDM optical communication are disclosed. The mode-locked state can be maintained irrespective of temperature change, without use of a temperature control |
| 7123406 |
Reflective semiconductor optical amplifier light source |
October 17, 2006 |
| A reflective semiconductor optical amplifier light source is disclosed. The reflective semiconductor optical amplifier light source includes a transmissive type semiconductor optical amplifier for creating and amplifying spontaneous emission light, a reflector for reflecting amplifie |
| 7119947 |
Dual-port broadband light source |
October 10, 2006 |
| A dual-port broadband light source is disclosed. In the dual-port broadband light source, a first beam splitter splits a first ASE at a first ratio into the second and third light paths and outputs the first ASE received from the second light path to the first light path. A second be |
| 7110170 |
Semiconductor optical amplifier having photo detector and method of fabricating the same |
September 19, 2006 |
| A gain-clamped semiconductor optical amplifier having photo detectors which are integrated on a single crystal substrate can detect optical intensities at input/output terminals of the optical amplifier. The semiconductor optical amplifier includes a first conductive semiconductor su |
| 7110168 |
Optical signal transmission apparatus including reflective gain-clamped semiconductor optical am |
September 19, 2006 |
| Disclosed are optical signal transmission apparatus including a reflective gain-clamped semiconductor optical amplifier and optical communication system using the optical signal transmission apparatus, which can improve modulation speed and optical power by effectively suppressing intens |
| 7104700 |
Gain flattening filter and gain flattened optical fiber amplifier employing the same |
September 12, 2006 |
| A gain flattening filter is provided to reduce volume and manufacturing cost of a gain flattened optical fiber amplifier, even when a required peak loss exceeds the limit of each dielectric thin film filter. The inventive gain flattening filter includes: a housing having a first open |
