Title:
THIN-FILM WAVEGUIDE TYPE LIGHT FREQUENCY SHIFTER AND OPTICAL INTEGRATED CIRCUIT CHIP FOR LIGHT FREQUENCY SHIFTER
Document Type and Number:
Japanese Patent JP3265011
Kind Code:
B2
Abstract:
PURPOSE: To provide the light frequency shifter of a thin-film waveguide type which is high in conversion efficiency and can take a wider range of frequency shift quantity.
CONSTITUTION: The input light of the waveform cos(wt) from a light input part 10 is divided to four guided light rays of an equal light power by branching parts 12, 14, 24. The waveforms of the guided light rays propagating in a waveguide 15A are modulated by optical phase modulators 6A, 6B to cos[ωt+&phiv (t)], the waveform in a waveguide 15B to cos[ωt-&phiv (t)] and the waveguide in a waveguide 17 to waveform=2cos(ωt)cos[&phiv (t)]=2cos(ωt)co[(2π/T)t]. The guided light in the waveguide 25A is modulated by an optical phase shifter 4 and optical phase modulators 8A, 8B to sin[ωt+&phiv (t-T/4)], the guided light in the waveguide 25B to sin[ωt-&phiv (t-T/4)], the guided light in the waveguide 27 =2sin(ωt)cos[2π/T)(tT/4)]=2sin(ωt)sin[(2π/T)t]. Then, the output light from an output light part 20 is made into total of both=2cos[ωt-(2π/T)t]=2cos{[ω-(2π/ T)]t} and only the (2π/T) is shifted in light frequency.
Inventors:
Shuichiro Asakawa
Chung Tai Ho
Chung Tai Ho
Application Number:
JP31776092A
Publication Date:
March 11, 2002
Filing Date:
November 02, 1992
Export Citation:
Assignee:
Suntech Co., Ltd.
International Classes:
G02B6/12; G02F2/02; (IPC1-7): G02F2/02
Domestic Patent References:
| JP6327820A |
Other References:
Ｋ．Ｋ．Ｗｏｎｇ ａｎｄ Ｒ．Ｍ．Ｄｅ Ｌａ Ｒｕｅ，Ｏｐｔｉｃｓ Ｌｅｔｔｅｒｓ，Ｖｏｌ．７，Ｎｏ．１１（１９８２），ｐｐ．５４６−５４８
山崎剛 他，電子情報通信学会技術研究報告，１９８７年１０月３０日，Ｖｏｌ．８７，Ｎｏ．２３２，ｐｐ．２９−３６
浅川修一郎 他，１９９３年電子情報通信学会春季大会講演論文集，１９９３年３月１５日，第４分冊，４−２４１頁
山崎剛 他，電子情報通信学会技術研究報告，１９８７年１０月３０日，Ｖｏｌ．８７，Ｎｏ．２３２，ｐｐ．２９−３６
浅川修一郎 他，１９９３年電子情報通信学会春季大会講演論文集，１９９３年３月１５日，第４分冊，４−２４１頁
Attorney, Agent or Firm:
Hidehiko Okada (2 outside)