Fiber-Optic Rotary Joint and Optical Link for RF-Antenna Measurement

Author

Cho, In-Kui ; Mun, Jung-Ik ; Han, Young-Tak ; Kim, Seong-Min ; Yun, Jae-Hoon

Author_Institution

Basic Res. Lab., Electron. & Telecommun. Res. Inst., Daejeon, South Korea

Volume

22

Issue

7

fYear

2010

fDate

4/1/2010 12:00:00 AM

Firstpage

447

Lastpage

449

Abstract

A practical optical rotary joint and optical links were prepared for an antenna measurement. The rotational variation loss of the optical rotary joint depends on the mechanical misalignments. To achieve 0.2 dB or less rotational variation loss, we proposed a new structure that has a noncontact interface using two size-mismatched fibers without a lens. The optical links are made of a distributed-feedback laser diode, a PIN-photodetector, and single-mode fiber jumper cords. The proposed rotary joint has very low rotational variation loss. The optical links are sufficiently stable to be applied to the antenna measurement. We verified that the rotary joint and optical links can be adopted in RF antenna test applications.

Keywords

antenna testing; distributed feedback lasers; integrated optoelectronics; optical communication equipment; optical links; optical losses; p-i-n photodiodes; radio receivers; PIN-photodetector; RF-antenna measurement; distributed-feedback laser diode; fiber-optic rotary joint; mechanical misalignments; noise figure 0.2 dB; optical links; rotational variation loss; single-mode fiber jumper cords; size-mismatched fibers; transmitter-receiver module; Distributed-feedback laser diode (DFB-LD); electrooptical; fiber-optic rotary joint (FORJ); optical fiber; optical fiber link; photodetector (PD);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2040985

Filename

5404756