公开(公告)号：US11018475B2

公开(公告)日：2021-05-25

申请号：US16561420

申请日：2019-09-05

Applicant: Electronics and Telecommunications Research Institute

Inventor： Namje Kim ,  O-Kyun Kwon ,  Miran Park ,  Tae-Soo Kim ,  Shinmo An ,  Won Seok Han

IPC: H01S5/12 ,  H01S5/028 ,  H01S5/042 ,  H01S5/026 ,  H01S5/024

Abstract: Provided is a quarter-wavelength shifted distributed feedback laser diode. The laser diode includes a substrate having a laser diode section and a phase adjustment section, a waveguide layer on the substrate, a clad layer on the waveguide layer, a grating disposed in the clad layer in the laser diode section, an anti-reflection coating disposed on one side walls, of the substrate, the waveguide layer, and the clad layer, adjacent to the laser diode section, and a high reflection coating disposed on the other side walls, of the substrate, the waveguide layer, and the clad layer, adjacent to the phase adjustment section.

公开(公告)号：US10985530B2

公开(公告)日：2021-04-20

申请号：US16539665

申请日：2019-08-13

Applicant: Electronics and Telecommunications Research Institute

Inventor： O-Kyun Kwon ,  Namje Kim ,  Miran Park ,  Tae-Soo Kim ,  Shinmo An ,  Won Seok Han

IPC: H01S5/125 ,  H01S5/065 ,  H01S5/34 ,  H01S5/042

Abstract: Provided is a tunable semiconductor laser including an active gain region in which an optical signal is generated according to a modulation signal, a mode control region in which a resonant mode is controlled according to a mode control signal, and a signal chirp of the optical signal is compensated according to a first compensation signal determined based on the modulation signal, and a distributed Bragg reflector (DBR) region in which an oscillation wavelength of the optical signal is determined based on a wavelength selection signal for the optical signal, a second compensation signal for compensating for a thermal chirp of the optical signal on a basis of the modulation signal, and a heater signal provided to a heater electrode.

公开(公告)号：US10291327B1

公开(公告)日：2019-05-14

申请号：US15855825

申请日：2017-12-27

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： O-Kyun Kwon ,  Namje Kim ,  Miran Park ,  Shinmo An ,  Won Seok Han

IPC: H04B10/07 ,  H04B10/40 ,  H04B10/50 ,  H04B10/54 ,  H04B10/60 ,  H04B10/077 ,  H04B10/2575

Abstract: An optical signal generating apparatus according to an embodiment of the inventive concept includes a first optical intensity modulator for modulating a first optical signal to generate a 2N-level (where N is a positive integer) second optical signal in the form of a binary signal, a first optical amplifier for amplifying the second optical signal to generate a third optical signal, and a second optical intensity modulator for modulating the third optical signal to generate a 2N+1-level fourth optical signal in the form of a binary signal. The optical signal generating apparatus according to an embodiment of the inventive concept may generate a low-cost, high-quality optical signal by using an optical device to generate a multi-level optical signal. Additionally, the optical signal generating apparatus according to an embodiment of the inventive concept may generate a multi-level optical signal by sequentially performing optical modulation and optical amplification operations.