Abstract: Disclosed is an optical transceiver module for controlling power in each lane. The optical transceiver module includes: a plurality of transmitting units formed in each lane in order to transmit signals to receive electric signals in each lane, convert the received electric signals into optical signals, and transmit the converted optical signals, respectively; a first switching means turning on/off power supplied to each of the plurality of transmitting units in each lane; a plurality of receiving units formed in each lane to receive optical signals in each lane, convert the received optical signals into electric signals, and output the converted electric signals, respectively; a second switching means turning on/off power supplied to each of the plurality of receiving units in each lane; and a control means controlling switching operations of the first switching means and the second switching means.

Abstract: There is provided an optical module having a top open can (TO-CAN) structure. The optical module having the TO-CAN structure includes a stem that accommodates an optical element or an electronic element therein, and a lead pin that is connected to the optical element or the electronic element through a hole of the stem, wherein the lead pin is bent in a “” shaped structure. Accordingly, the optical module with the TO-CAN structure may operate at high speed and be manufactured at low cost.

Abstract: Disclosed is a structure for impedance matching by applying a CPW structure to an impedance discontinuous portion on a data signal line or using a micro-strip open stub so as to be used for high-speed transmission by a flexible PCB. According to the present invention, it is possible to fabricate a flexible PCB capable of performing low-priced and high-speed transmission.

Abstract: An optical module includes a stem, an optical element, data signal lead pins, a printed circuit board, and a post portion. The optical element is mounted on one surface of the stem. The data signal lead pins are connected to the optical element, and protrudes through the other surface of the stem. The printed circuit board has one surface on which data signal transmission lines for contact with the data signal lead pins are formed and the other surface on a part of which a stiffener is formed to protrude. The post portion protrudes from the other surface of the stem, supports the printed circuit board while in close contact with the stiffener such that the data signal lead pins can contact the data signal transmission lines while being disposed linearly above the data signal transmission lines, and includes a coupling portion to be coupled with the stiffener.

Abstract: A reflective type optical delay interferometer includes a coupler to divide an optical signal into two optical signals; a first optical waveguide connected to the coupler, to have a first optical delay path for transmitting a first optical signal which is one of the two optical signals; a second optical waveguide connected to the coupler, to transmit a second optical signal which is the other of the two optical signals and to have an optical delay path asymmetrical to the first optical delay path; and first and second polarization rotation reflection devices respectively connected to the first and second optical waveguides, wherein the first polarization rotation reflection device rotates polarizations of the first optical signal and the reflected first optical signal and the second polarization rotation reflection device rotates polarizations of the second optical signal and the reflected second optical signal.

Abstract: Provided are a multiplexing and demultiplexing apparatus and method of a multi-wavelength optical signal that may dispose each of thin film filters in a location where a zigzag reflection occurs in a zigzag optical path, and thereby multiplex or demultiplex a multi-wavelength optical signal using the thin film filters. Each of the thin film filters may transmit an optical signal having a predetermined wavelength which is incident at a predetermined incidence angle, and reflect a remaining wavelength optical signal at a predetermined reflection angle.

Abstract: An optical transceiver includes: a transmission unit configured to convert a first electrical signal into a first optical signal and transmit the converted first optical signal; a first power supply unit configured to supply power to the transmission unit; and a controller configured to control the first power supply unit, wherein the controller controls an operation of the first power supply unit according to whether or not the first electrical signal is inputted to the transmission unit.

Abstract: An apparatus for cancellation of a transient voltage spike, includes: a first photodiode for detecting a photon in an optical signal input from an outside, a second photodiode for detecting the photon in the optical signal input from the outside, and a differential amplifier for canceling the same signal component in a first output signal of the first photodiode and a second output signal output from the second photodiode, and to amplify a voltage difference between the first output signal and the second output signal. The transient voltage spike cancellation apparatus cancel a transient voltage spike occurring in an avalanche photodiode operating in a gated Geiger mode, using the differential amplifier.

Abstract: A multi-wavelength optical transmitting module includes a housing, an optical output block, an optical transmitting block, and an optical multiplexer (MUX) block. The housing has a first coupling hole and a second coupling hole respectively formed in opposite surfaces thereof. The optical output block is coupled to the first coupling hole of the housing, is connected to an optical signal connector, and includes a first lens. The optical transmitting block is coupled to the second coupling hole of the housing and is connected to an electrical signal connector. In addition, the optical transmitting block includes a plurality of transmitting devices which respectively output light having different wavelengths and are arranged parallel to the optical output block, and a plurality of second lenses which are arranged on a light output side of the transmitting devices to correspond respectively to the transmitting devices.

Abstract: A wavelength-division apparatus and a wavelength combining apparatus are provided. Each of the wavelength-division apparatus and the wavelength combining apparatus includes a transparent block having one surface which is coated with an anti-reflective coating layer and the other surface which is coated with a partial transmitting coating layer. Each of the anti-reflective coating layer and the partial transmitting coating layer is coupled to a plurality of wavelength-selective filters that separate optical signals of different wavelengths through different paths other than a transmission path or a receiving path. Thus, the optical signals of the respective wavelengths output through the different paths can be used for various purposes such as monitoring the signal intensity and/or the signal quality.

Abstract: Provided are a method and apparatus for increasing transmission capacity for large-capacity high-speed signal transmission in an optical transport network (OTN). A method and apparatus for increasing transmission capacity are needed, which can transmit a large-capacity high-speed signal in order to transmit a signal through a united OTN by adapting signals from various tributary signal networks which have been independently operated for voice, image, or data transmission. Although various types of techniques such as Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), and an optical Printed Circuit Board (PCB) method have been performed, the techniques have various limitations. Therefore, a method and apparatus is provided for embodying a large-capacity optical transmission network, which overcome the limitations by using a Virtual Concatenation (VC) method.

Abstract: An active alignment method for a multi-channel optical transmitter and receiver is disclosed. The active alignment method for a multi-channel optical transmitter includes actively aligning an optical signal generator with an optical multiplexer based on optical outputs of a plurality of wavelengths from the optical signal generator and an optical output of the optical multiplexer, and actively aligning the optical multiplexer with a fiber optic coupler based on an optical output of the optical multiplexer and an optical output of the fiber optic coupler.

Abstract: A method and apparatus for generating an optical short pulse for quantum cryptography communication is provided. The apparatus is incorporated as a module in an electronic integrated circuit chip, such as a field programmable gate array (FPGA) chip which performs quantum key distribution post-processing and open channel optical signal processing of a quantum cryptography system. The apparatus generates an electrical short pulse and converts the electrical short pulse into an optical short pulse, and it is possible to manufacture a compact apparatus for generating an optical short pulse for quantum cryptography communication.

Abstract: An optical transceiver for optimizing transfer characteristic of an optical interferometer and a method of optimizing transfer characteristic of an optical interferometer of an optical transceiver are provided. It is possible to improve the transmission performance of the optical transceiver by optimizing the transfer characteristic of the optical interferometer included in an optical receiver of the optical transceiver which transmits and receives an optical signal in a phase modulation scheme.

Abstract: There are provided a wideband electric signal mixer capable of mixing two inputted electric signals having a wideband frequency spectrum. The wideband electric signal mixer includes an input terminal controlling an input interface and a phase of a differential signal of a first electric signal and a second electric signal, having a wideband spectrum; a signal mixing terminal comprising a transmission gate switch receiving and outputting the second electric signal and mixing the first electric signal with the second electric signal by turning the transmission gate switch on and off using the differential signal of the first electric signal passing through the input terminal; and an output terminal providing an output interface between a mixing signal outputted from the signal mixing terminal and an external circuit unit and amplification function of the mixing signal.

Abstract: Provided are an apparatus and method for generating an optical return-to-zero (RZ) signal using an electronic integrated circuit that generates an electric RZ signal. The apparatus for generating an optical RZ signal includes an electronic integrated circuit generating an electric return-to-zero (RZ) signal based on an input data signal and a clock signal, a driving amplifier amplifying the electric RZ signal, a light source outputting a carrier having a predetermined wavelength, and a modulator modulating the carrier according to the amplified RZ signal. The electronic integrated circuit can be constructed in a single electronic circuit chip, and thus the size of the optical transmission system can be reduced.

Abstract: Provided are a method and apparatus for increasing transmission capacity for large-capacity high-speed signal transmission in an optical transport network (OTN). A method and apparatus for increasing transmission capacity are needed, which can transmit a large-capacity high-speed signal in order to transmit a signal through a united OTN by adapting signals from various tributary signal networks which have been independently operated for voice, image, or data transmission. Although various types of techniques such as Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), and an optical Printed Circuit Board (PCB) method have been performed, the techniques have various limitations. Therefore, a method and apparatus is provided for embodying a large-capacity optical transmission network, which overcome the limitations by using a Virtual Concatenation (VC) method.