Samsung Electronics Co., Ltd.

Electronics and Telecommunications Research Institute

Bo-Hun Choi

Hyo-Hoon Park

Jyung-Chan Lee

Joo-nyung Jang

Kyung-ho Kwack

Seung-Kwan Kim

Moo-Jung Chu

An improved long wavelength-band EDFA (L-band EDFA) is disclosed. The EDFA includes an input terminal for receiving signal light, a pumping unit for pumping a 1,530 nm wavelength band pumping light, a WDM coupler for multiplexing the signal light and the pumping light, and an EDF pumped by a 1,530 nm wavelength band pumping light for amplifying the signal light. Compared with conventional 1,480 nm pumping, the EDFA pumped by 1,530 nm band pumping have about two times higher power conversion efficiency.

L-band erbium-doped fiber amplifier pumped by 1530 nm-band pump

An amplitude mask used in a long period grating filter manufacturing apparatus includes a metal substrate having a periodic transmission area having a period for selectively transmitting light and a non-transmission area through which light does not pass; and a piezo-electric transducer located on the non-transmission area of the metal substrate for changing the period of the periodic transmission area. The periodic transmission area is located in the middle of the metal substrate and the piezo-electric transducer is located on opposite sides of the periodic transmission area. Piezo-electric transducers may be located on the non-transmission area to vary the period of the periodic transmission area.

Amplitude mask and apparatus for manufacturing long period grating

Growing community of inventors

Seoul, South Korea

Bo-Hun Choi