Electronics and Telecommunications Research Institute

Sae Kyoung Kang

Joon Ki Lee

Joon Young Huh

Hwan Seok Chung

Jyung Chan Lee

Heuk Park

Jong Hyun Lee

Je Soo Ko

Hyunwoo Cho

Hun Sik Kang

Kwang Joon Kim

Jie Hyun Lee

Jong-Yoon Shin

Sang Rok Moon

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.

Optical transmitter based on vestigial sideband modulation

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.

Transmitter for transmitting optical signal in optical communication system and method of operating the same

A flexible printed circuit board (FPCB) for an optical module includes: a signal via pad connected with a signal lead pin of the optical module; a ground layer spaced apart from the signal via pad; an isolation gap formed between the signal via pad and the ground layer; and a protective layer which is formed at a portion that comprises the isolation gap, and which, when connected with the signal via pad, compensates for parasitic inductance caused by a protruding signal lead pin.

Flexible printed circuit board for optical module

Provided is a phase error compensating apparatus. The phase error compensating apparatus may include a waveguide array disposed between a first free propagation region and a second free propagation region and configured to allow a light signal passed through the first free propagation region to move toward the second free propagation region, in which a length of each of the waveguides included in the waveguide array may be adjusted to compensate for a phase error of light signals passed through the waveguides.

Phase error compensating apparatus

A receptacle-collimator assembly and a multi-wavelength optical receiver module. The receptacle-collimator assembly includes a receptacle configured to receive a wavelength-multiplexed optical signal; and a collimator integrated with the receptacle and configured to generate a collimated beam signal from a multi-wavelength optical signal received from the receptacle and output the beam signal.

Receptacle-collimator assembly and multi-wavelength optical receiver module

An optical transceiver of a flexible modulation format. The optical transceiver may include an optical transmitter to convert an electrical signal to an optical signal and transmit the optical signal, an optical receiver to receive and convert the optical signal to an electrical signal, and a controller to set modulation formats of the optical transmitter and the optical receivers according to modulation format information.

Optical transceiver of flexible modulation format

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.

Active alignment method for multi-channel optical transmitter and receiver, which has an optical signal generator with an optical multiplexer, which has an optical signal generator with an optical multiplexer

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.

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Daejeon, South Korea

Sae Kyoung Kang