Abstract: Disclosed herein is an optical transmitter for generating a vestigial sideband (VSB) optical signal. The optical transmitter includes: a modulator configured based on a photonic integrated chip (PIC); an optical fiber block; and a lensed thin film filter implemented between the modulator configured based on the PIC and the optical fiber block. The PIC includes at least one grating coupler, and the lensed thin film filter is disposed so that an angle of an optical signal emitted from a first grating coupler of the PIC coincides with an angle of incident (AOI) of the lensed thin film filter to design the first grating coupler and the lensed thin film filter.

Abstract: Provided is an optical submodule which includes an optical transmission/reception module that optically couples an optical transmission signal and an optical reception signal into one optical fiber and a flexible printed circuit board (FPCB) mounted on the optical transmission/reception module that functions as an electrical signal interface with a main board, and an electrical signal line of an optical transmission channel for the optical transmission signal and an electrical signal line of an optical reception channel for the optical reception signal may be deployed on different sides of the FPCB.

Abstract: An optical transmitter based on optical time division multiplexing is disclosed, which may solve the issues of complex structure and operation of a multilevel-OTDM-based optical transmitter while using a multilevel signal modulation format and OTDM technology that may increase the transmission rate of an optical transmitter with limited bandwidth.

Abstract: An optical transmitter based on optical time division multiplexing is disclosed, which may solve the issues of complex structure and operation of a multilevel-OTDM-based optical transmitter while using a multilevel signal modulation format and OTDM technology that may increase the transmission rate of an optical transmitter with limited bandwidth.

Abstract: An optical module includes an interface electrically connected to an external device to receive a data signal to be transmitted, a signal processor configured to perform serialization and signal modulation on the received data signal, an optical transceiver configured to generate an optical transmission signal by receiving a direct current (DC) light source, in which a plurality of light sources having different wavelengths are multiplexed, from an optical power supply and performing optical modulation thereon through the serialized and modulated data signal, and an optical fiber connector configured to output the generated optical transmission signal to the external device and receive an optical reception signal from the external device.

Abstract: An optical fiber coupler includes a plurality of optical fibers parallel to each other in a first direction, an optical fiber array block (FAB) configured to maintain a constant center-to-center distance between the plurality of optical fibers, and an optical waveguide block including a plurality of optical waveguides coupled to the plurality of optical fibers, respectively, and configured to transfer optical signals transmitted through the plurality of optical fibers connected to the optical FAB in a second direction in which a photonics chip is placed and which is different from the first direction.

Abstract: A manufacturing method and application of an optical interconnection module are disclosed. According to example embodiments, by providing the method of manufacturing the optical interconnection module in which an optical fiber optical coupler is disposed at its lower portion by using the FOWLP process, it is possible to provide advantages such as lightness, thinness and compactness of the optical interconnection module, guarantee of signal integrity, and high yield in mass production. Further, it is possible to provide a structure providing an electrical ground to an electronic chip by mounting the electronic chip on ETB and capable of being used as a heat dissipation path.

Abstract: An optical coupling method and apparatus are disclosed. The optical coupling method improve the speed of optical alignment between an optical fiber and a grating coupler (GC) of an optical coupling apparatus for a characteristic test of a silicon photonic integrated circuit (Si-PIC) chip by using a reflective grating couplers disposed on the Si-PIC chip.

Abstract: A bidirectional optical transceiver module includes an optical Tx block including a light source configured to output an optical Tx signal; an optical Rx block provided in parallel to the optical Tx block and including a PD configured to receive an optical Rx signal; a wavelength distributor configured to change a travel path of the optical Tx signal; an optical filter provided on a predetermined area of a first surface of the wavelength distributor adjacent to the optical Tx or Rx block and configured to transmit the optical Rx signal and reflect the optical Tx signal; a first lens provided between the optical Tx block and the wavelength distributor; a second lens provided between the optical Rx block and the wavelength distributor; and a third lens configured to output the optical Tx signal to outside and output the optical Rx signal from the outside to the wavelength distributor.

Abstract: A bidirectional optical transceiver module includes an optical Tx block including a light source configured to output an optical Tx signal; an optical Rx block provided in parallel to the optical Tx block and including a PD configured to receive an optical Rx signal; a wavelength distributor configured to change a travel path of the optical Tx signal; an optical filter provided on a predetermined area of a first surface of the wavelength distributor adjacent to the optical Tx or Rx block and configured to transmit the optical Rx signal and reflect the optical Tx signal; a first lens provided between the optical Tx block and the wavelength distributor; a second lens provided between the optical Rx block and the wavelength distributor; and a third lens configured to output the optical Tx signal to outside and output the optical Rx signal from the outside to the wavelength distributor.

Abstract: An optical transceiver and a method of setting a wavelength of the optical transceiver. The optical transceiver may include a thermoelectric cooler (TEC) configured to maintain a constant operating temperature of a transmitter optical sub-assembly (TOSA) of the optical transceiver based on an installation environment of the optical transceiver, a plurality of laser diodes arranged on the top of the TEC and configured to output optical signals having different wavelengths, an optical multiplexer configured to multiplex the optical signals having different wavelengths, output through the plurality of laser diodes, and a wavelength controller configured to control the wavelengths of the optical signals output through the plurality of laser diodes such that optical outputs of the optical signals having different wavelengths, detected through the optical multiplexer, are maximized, wherein the wavelength controller may be individually arranged in one region of each of the plurality of laser diodes.

Abstract: An optical coupling method and apparatus are disclosed. The optical coupling method improve the speed of optical alignment between an optical fiber and a grating coupler (GC) of an optical coupling apparatus for a characteristic test of a silicon photonic integrated circuit (Si-PIC) chip by using a reflective grating couplers disposed on the Si-PIC chip.

Abstract: An optical module includes an interface electrically connected to an external device to receive a data signal to be transmitted, a signal processor configured to perform serialization and signal modulation on the received data signal, an optical transceiver configured to generate an optical transmission signal by receiving a direct current (DC) light source, in which a plurality of light sources having different wavelengths are multiplexed, from an optical power supply and performing optical modulation thereon through the serialized and modulated data signal, and an optical fiber connector configured to output the generated optical transmission signal to the external device and receive an optical reception signal from the external device.

Abstract: An optical transmitting module includes: light sources configured to output optical signals, an optical multiplexer configured to multiplex the optical signals output from the light sources, a collimating lens configured to convert an optical signal output from the optical multiplexer to a form of parallel beam, a package inside which the light sources, the optical multiplexer, and the collimating lens are provided, and an optical isolator disposed on one inner surface of the package, in which the optical signals output from the light sources are multiplexed into a single optical signal through the optical multiplexer disposed inside the package, and the single optical signal passes through the collimating lens and is then optically coupled to an optical fiber stub in a receptacle through a focusing lens disposed outside the package to be output externally.

Abstract: An optical signal transmission apparatus generates a multi-level optical signal from a multi-level electric signal. The optical signal transmission apparatus detects, based on a supervisory signal generated from an optical signal, an electric-to-optical (E/O) conversion characteristic of an E/O converter configured to convert an electric signal into an optical signal. For example, when the E/O converter generates a multi-level optical signal from a multi-level electric signal based on a bias signal, the optical signal transmission apparatus determines a correspondence relationship between the bias signal and the optical signal. The optical signal transmission apparatus adjusts a use range of intensities of the bias signal based on the determined correspondence relationship so that the E/O converter may linearly operate.

Abstract: An optical transmitting module includes: light sources configured to output optical signals, an optical multiplexer configured to multiplex the optical signals output from the light sources, a collimating lens configured to convert an optical signal output from the optical multiplexer to a form of parallel beam, a package inside which the light sources, the optical multiplexer, and the collimating lens are provided, and an optical isolator disposed on one inner surface of the package, in which the optical signals output from the light sources are multiplexed into a single optical signal through the optical multiplexer disposed inside the package, and the single optical signal passes through the collimating lens and is then optically coupled to an optical fiber stub in a receptacle through a focusing lens disposed outside the package to be output externally.

Abstract: An optical multiplexer including an optical waveguide block including a plurality of waveguides for adjusting an optical path of the plurality of optical signals. Optical signals generated in light sources having different wavelengths are input to ports of one side that is an input end of the optical waveguide block, propagated through waveguides connected to the ports, and output to ports of another side that is an output end of the optical wavelength block. Intervals between the waveguides decrease in a direction from the input end to the output end. Intervals between the ports of the input end are smaller than intervals between the ports of the output end. The optical waveguide block has a structure in which at least one layer having at least one waveguide is laminated.

Abstract: An optical receiver includes: an optical demultiplexer to demultiplex an optical signal in which a plurality of wavelengths is multiplexed and divide the optical signal into optical signals corresponding to the plurality of wavelengths, respectively; a reflector to change a progress direction of the divided optical signals; an optical coupling lens including, in an array form, light transmission lenses through which the divided optical signals are transmitted, respectively; a plurality of photodetectors to mount on a photodiode (PD) substrate provided on the optical coupling lens, receive the divided optical signals that are transmitted through the light transmission lenses of the optical coupling lens, respectively, and convert the received optical signals to electrical signals; and a plurality of trans impedance amplifiers provided at desired intervals to electrically connect to the plurality of photodetectors through wire bonding and amplify the received plurality of electrical signals to be a desired magn

Abstract: A transmitter for transmitting an optical signal in an optical communication system includes a plurality of light sources configured to output optical signals; a plurality of first optical couplers configured to multiplex the optical signals, which are output from the plurality of light sources, to generate a first optical signal, and output the first optical signal through a first output port and a second output port of each of the plurality of first optical couplers; a first monitoring unit configured to monitor the first optical signal which is output through the second output port of each of the plurality of first optical couplers; and a controller configured to control an optical output of each of the plurality of light sources on the basis of a result of the monitoring.

Abstract: An optical multiplexer including an optical waveguide block including a plurality of waveguides for adjusting an optical path of the plurality of optical signals. Optical signals generated in light sources having different wavelengths are input to ports of one side that is an input end of the optical waveguide block, propagated through waveguides connected to the ports, and output to ports of another side that is an output end of the optical wavelength block. Intervals between the waveguides decrease in a direction from the input end to the output end. Intervals between the ports of the input end are smaller than intervals between the ports of the output end. The optical waveguide block has a structure in which at least one layer having at least one waveguide is laminated.