Abstract: Provided are a laser element and a method for manufacturing the same, in which the laser element includes a first clad layer, an optical waveguide disposed on the first clad layer, a second clad layer disposed on the optical waveguide, a first electrode disposed on the second clad layer, and a dummy clad disposed on the optical waveguide and apart from the second clad layer and the first electrode.

Abstract: An optical transceiver including a submount, a Mach-Zehnder Modulator (MZM), bonding wires, and a low pass filter type matching network is provided. The MZM includes an input port and an output port and disposed on the submount. The bonding wires are coupled to the submount and the MZM. The low pass filter type matching network is coupled to the bonding wires and is configured to absorb inductance of the bonding wires at a high frequency.

Abstract: According to an embodiment, a wavelength tunable laser comprising a gain region and a wavelength tunable area is disclosed. The wavelength tunable area comprises: a lower clad layer; a passive optical waveguide positioned on the lower clad layer; an upper clad layer positioned on the passive optical waveguide; a drive electrode positioned on the upper clad layer; a current blocking layer positioned on the drive electrode; a heater positioned on the current blocking layer; and a first insulating groove and a second insulating groove which are positioned so as to face each other with the passive optical waveguide therebetween.

Abstract: Provided are a laser element and a method for manufacturing the same, in which the laser element includes a first clad layer, an optical waveguide disposed on the first clad layer, a second clad layer disposed on the optical waveguide, a first electrode disposed on the second clad layer, and a dummy clad disposed on the optical waveguide and apart from the second clad layer and the first electrode.

Abstract: An optical transceiver including a submount, a Mach-Zehnder Modulator (MZM), bonding wires, and a low pass filter type matching network is provided. The MZM includes an input port and an output port and disposed on the submount. The bonding wires are coupled to the submount and the MZM. The low pass filter type matching network is coupled to the bonding wires and is configured to absorb inductance of the bonding wires at a high frequency.

Abstract: An optical transceiver including a submount, a Mach-Zehnder Modulator (MZM), bonding wires, and a low pass filter type matching network is provided. The MZM includes an input port and an output port and disposed on the submount. The bonding wires are coupled to the submount and the MZM. The low pass filter type matching network is coupled to the bonding wires and is configured to absorb inductance of the bonding wires at a high frequency.

Abstract: According to an embodiment, a wavelength tunable laser comprising a gain region and a wavelength tunable area is disclosed. The wavelength tunable area comprises: a lower clad layer; a passive optical waveguide positioned on the lower clad layer; an upper clad layer positioned on the passive optical waveguide; a drive electrode positioned on the upper clad layer; a current blocking layer positioned on the drive electrode; a heater positioned on the current blocking layer; and a first insulating groove and a second insulating groove which are positioned so as to face each other with the passive optical waveguide therebetween.

Abstract: A transmitter optical sub-assembly (TOSA) with low group delay (GD) performance over an operating frequency range of the TOSA is designed based on a synthesis of low pass filters. The low pass filters include a first stage low pass filter (LPF1) and a second stage low pass filter (LPF2) coupled to the LPF1 in a cascade form and a load impedance. The LPF1 and the LPF2 are configured to include inductance of stray components in the TOSA.

Abstract: An optical transceiver including a submount, a Mach-Zehnder Modulator (MZM), bonding wires, and a low pass filter type matching network is provided. The MZM includes an input port and an output port and disposed on the submount. The bonding wires are coupled to the submount and the MZM. The low pass filter type matching network is coupled to the bonding wires and is configured to absorb inductance of the bonding wires at a high frequency.

Abstract: An apparatus for saving power in an field programmable gate array (FPGA) in an optical communication device is provided. The apparatus includes at least one ring oscillator having an operating frequency disposed inside the FPGA, a core voltage switching unit configured to supply a core operating voltage to the FPGA, and control logic configured to adaptively output an adjusted new core voltage to the FPGA via the core voltage switching unit. The control logic is configured to output a core voltage control signal to the core voltage switching unit based on the operating frequency of the at least one ring oscillator. The core voltage switching unit is further configured to supply the adjusted new core voltage to the FPGA in accordance with the core voltage control signal.

Abstract: An optical transmitter and an optical module including the optical transmitter are provided. The optical transmitter may include a support substrate, a temperature control module disposed on the support substrate, a sub-mount disposed on the temperature control module, a prism disposed on the temperature control module and having a sloped surface, a light receiving element disposed on the temperature control module, a light emitting element disposed on the sub-mount, and a thermistor disposed on the sub-mount. The light receiving element may be disposed separately from the sub-mount in a first direction, and the prism may be disposed between the light receiving element and the sub-mount. Some first light emitted from the light emitting element may be reflected by the sloped surface of the prism, and some of the first light may pass through the prism and be received by the light receiving element.

Abstract: Disclosed is an optical module including an optical transmitter which is configured to output a first optical signal, an optical receiver which is configured to receive a second optical signal, a holder which is configured to include an optical fiber on which the first optical signal is incident and from which the second optical signal is emitted. The optical module further includes a first optical filter disposed between the optical transmitter and the holder to transmit the first optical signal and reflect the second optical signal, a first parallel light lens disposed between the first optical filter and the optical transmitter, and a second parallel light lens disposed between the first optical filter and the holder.

Abstract: An apparatus for saving power in an field programmable gate array (FPGA) in an optical communication device is provided. The apparatus includes at least one ring oscillator having an operating frequency disposed inside the FPGA, a core voltage switching unit configured to supply a core operating voltage to the FPGA, and control logic configured to adaptively output an adjusted new core voltage to the FPGA via the core voltage switching unit. The control logic is configured to output a core voltage control signal to the core voltage switching unit based on the operating frequency of the at least one ring oscillator. The core voltage switching unit is further configured to supply the adjusted new core voltage to the FPGA in accordance with the core voltage control signal.

Abstract: An optical transceiver for use in network device in a packet network is provided. The network device may not be capable of providing a ring topology without use of the apparatus. The network device is configured to support at least two optical interfaces and an electrical interface, and coupled to an optical link. The optical transceiver includes a memory, a processor coupled to the memory, and a scheduler coupled to the processor. The scheduler of the optical transceiver is configured to perform as an information base for forwarding and transferring of packets and to use an optical link as a packet buffer.

Abstract: An optical module includes a case including an optical filter, a receptacle coupled to the case, an optical receiver, and an optical transmitter. The receptacle includes a recess formed along an outer circumferential surface thereof. The recess may be formed by a first side wall and a second side wall which face each other and a bottom surface coupling the first side wall to the second side wall. Further, at least one of the first side wall and the second side wall may include an insulating material.

Abstract: An optical module includes a case including an optical filter, a receptacle coupled to the case, an optical receiver, and an optical transmitter. The receptacle includes a recess formed along an outer circumferential surface thereof. The recess may be formed by a first side wall and a second side wall which face each other and a bottom surface coupling the first side wall to the second side wall. Further, at least one of the first side wall and the second side wall may include an insulating material.

Abstract: Disclosed is an electrical transceiver for synchronous Ethernet, including: a first interface connected with a host; a second interface including a physical layer (PHY) transceiver connected with a serial link; and a processor connected with the first interface and the second interface, wherein the processor includes a timing control unit controlling a transmission signal transmitted to the second interface from the first interface and a reception signal transmitted to the first interface from the second interface to have the same time delay.

Abstract: An optical transceiver for use in network device in a packet network is provided. The network device may not be capable of providing a ring topology without use of the apparatus. The network device is configured to support at least two optical interfaces and an electrical interface, and coupled to an optical link. The optical transceiver includes a memory, a processor coupled to the memory, and a scheduler coupled to the processor. The scheduler of the optical transceiver is configured to perform as an information base for forwarding and transferring of packets and to use an optical link as a packet buffer.

Abstract: An optical transmitter and an optical module including the optical transmitter are provided. The optical transmitter may include a support substrate, a temperature control module disposed on the support substrate, a sub-mount disposed on the temperature control module, a prism disposed on the temperature control module and having a sloped surface, a light receiving element disposed on the temperature control module, a light emitting element disposed on the sub-mount, and a thermistor disposed on the sub-mount. The light receiving element may be disposed separately from the sub-mount in a first direction, and the prism may be disposed between the light receiving element and the sub-mount. Some first light emitted from the light emitting element may be reflected by the sloped surface of the prism, and some of the first light may pass through the prism and be received by the light receiving element.

Abstract: Disclosed is an optical module including an optical transmitter which is configured to output a first optical signal, an optical receiver which is configured to receive a second optical signal, a holder which is configured to include an optical fiber on which the first optical signal is incident and from which the second optical signal is emitted. The optical module further includes a first optical filter disposed between the optical transmitter and the holder to transmit the first optical signal and reflect the second optical signal, a first parallel light lens disposed between the first optical filter and the optical transmitter, and a second parallel light lens disposed between the first optical filter and the holder.