Title:
【発明の名称】光学デバイス
Document Type and Number:
Japanese Patent JP3188696
Kind Code:
B2
Abstract:
PCT No. PCT/GB91/02133 Sec. 371 Date May 19, 1993 Sec. 102(e) Date May 19, 1993 PCT Filed Dec. 2, 1991 PCT Pub. No. WO92/11562 PCT Pub. Date Jul. 9, 1992.An optical mixing device (10) incorporates a rectangular multimode waveguide (14), with an input region (22) and an output region (24), two square section input waveguides (26, 28), and a detector (34). The input waveguides (26, 28) are arranged to provide first and second input radiation beams respectively to the input region (22), each beam being in the form of a square waveguide fundamental mode beam. Modal dispersion along the multimode waveguide (14) produces a single maximum incident on the detector (34) when the input beams are in phase with one another, and two maxima of like magnitude located on opposite sides of the detector (34) when the input beams are in antiphase. Intermediate these two situations three maxima are produced, the amplitudes depending on phase difference. The first and second input beams may be of like frequency producing a time-independent device output. The input beams may alternatively have different frequencies. For instance the first input beam may be a local oscillator signal produced by a coherent source of stable frequency, and the second input beam may be a Doppler shifted version of an output signal from that source. The device output then provides an intermediate frequency signal. The intensity incident on the detector (34) thus varies at the difference frequency of the two inputs. Similar devices may be constructed with additional inputs and with different forms of output.
Inventors:
The Enkins, Richard Michael
Dave Lieu, Robert William Jiyoung
Dave Lieu, Robert William Jiyoung
Application Number:
JP50006492A
Publication Date:
July 16, 2001
Filing Date:
December 02, 1991
Export Citation:
Assignee:
Great Britain
International Classes:
G02B6/126; G02B6/122; G02B6/28; G02F2/00; G02F2/02; H01P1/16; (IPC1-7): G02B6/28; G02F2/00
Domestic Patent References:
| JP1156703A | ||||
| JP3179332A | ||||
| JP5157457A |
Other References:
【文献】欧州特許出願公開330457(EP,A1)
【文献】仏国特許出願公開2634288(FR,A1)
【文献】英国特許出願公開2207525(GB,A)
【文献】国際公開89/4988(WO,A1)
【文献】米国特許4950045(US,A)
【文献】仏国特許出願公開2634288(FR,A1)
【文献】英国特許出願公開2207525(GB,A)
【文献】国際公開89/4988(WO,A1)
【文献】米国特許4950045(US,A)
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)