Electronics and Telecommunications Research Institute

Sanghwa Yoo

Joon Ki Lee

Sae-Kyoung Kang

Heuk Park

Joon Young Huh

Jyung Chan Lee

Kwangjoon Kim

Jongtae Song

Sooyeon Kim

According one embodiment of the present disclosure, there is provided a silicon photonics-based optical modulation device having two metal layers. The optical modulation device includes a phase shifter, a ground unit, and a pad unit. The phase shifter includes a first signal electrode, a second signal electrode, and at least two ground electrodes formed in a first metal layer. The phase shifter includes two silicon optical waveguides. The ground unit is formed in a second metal layer different from the first metal layer. The pad unit is formed in the second metal layer, provided with a first local area electrically connected to the ground unit, and electrically connected to the first signal electrode and the second signal electrode via a second local area thereof electrically isolated from the ground unit.

Silicon photonics-based optical modulation device with two metal layers

A silicon photonics-based optical modulator is disclosed. The optical modulator includes first radio frequency (RF) metal electrodes that operate as a ground, phase shifters disposed between the first RF metal electrodes for optically modulating an optical signal transmitted along an optical waveguide, second RF metal electrodes disposed between the phase shifters for providing an RF electrical signal received from a driving driver located outside of the optical modulator through one end, resistor-inductors (RL) connected to another end of the second RF metal electrodes, an inductive line disposed between the RLs and a power supply for applying a bias voltage to the optical modulator and the driving driver, and a silicon capacitor disposed between the RLs and the power supply for preventing a degradation of an RF response characteristic of the silicon photonics-based optical modulator caused by the inductive line.

Silicon photonics-based optical modulator

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.

Optical transmitter based on optical time division multiplexing

Disclosed is a silicon photonics-based optical transmission apparatus. The apparatus includes an optical modulator chip of a ground-signal-ground (GSG) electrode array including two phase shifters for differential driving, a sub-substrate including a metal electrode of a periodic pattern to connect two ground metal electrodes to each other at a GSG electrode connected to each of the two phase shifters, and a solder bump having a same periodic pattern as the metal electrode of the sub-substrate to connect the ground metal electrodes of the optical modulator chip and the metal electrode of the periodic pattern of the sub-substrate.

Silicon photonics-based optical transmission apparatus

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.

Bidirectional optical transceiver module

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.

Optical coupling method and apparatus

A silicon-based optical modulator. An optical modulator of a Mach-Zehnder type includes an optical coupler configured to separate a single optical signal into two optical signals having same output power, two phase shifters having a PN junction through which the two optical signals separated through the optical coupler pass respectively, a plurality of electrodes configured to apply an electrical signal to the two phase shifters, and two PN diodes disposed between the two phase shifters and configured to adjust an operating bandwidth of the optical modulator. The optical signals respectively passing through the two phase shifters have phases that change as a width of a depletion region changes based on a magnitude of a reverse voltage provided to the two phase shifters through the electrodes and a refractive index changes.

Silicon-based optical modulator

An optical signal transmission apparatus including a temperature-independent wavelength tunable laser includes a distributed Bragg reflector (DBR) laser including a DBR mirror region configured to convert a wavelength of an output optical signal based on a first supply current, and an optical gain region configured to control a gain of the output optical signal based on a second supply current, a semiconductor optical amplifier (SOA) configured to amplify an optical signal output from the DBR laser based on a third supply current, and a processor configured to supply a compensation current to the optical gain region based on a wavelength conversion request, to suppress a wavelength overshoot due to a carrier effect caused by the first supply current provided to the DBR mirror region.

Optical signal transmission apparatus including temperature-independent wavelength tunable laser, and wavelength tuning method using the same

An optical transmission method includes outputting a first light based on a first electronic signal, outputting a second light based on a second electronic signal, and polarizing and combining the first light and the second light, and outputting the polarized and combined first and second lights to an optical fiber.

Optical transmission method and apparatus

An optical transmitter includes an optical modulator configured to modulate an optical signal, a dual-stage space switch configured to receive, as an input, the modulated optical signal from the optical modulator, and output ports configured to control light outputs based on an operation of the dual-stage space switch.

Growing community of inventors

Daejeon, South Korea

Sanghwa Yoo