Optical waveguides – Integrated optical circuit
Patent
1995-08-24
1997-07-08
Healy, Brian
Optical waveguides
Integrated optical circuit
385 15, 385 16, 385 39, 385 40, 385130, 385132, 356345, 356350, 356346, G02B 612, G01B 902
Patent
active
056470320
ABSTRACT:
To measure the coherence length of light, an incident beam (20) is caused to interfere with replicas of itself after having variable delays. Variable delays are generated by passing a beam (40) that is a part of the incident beam (20) around a loop (46). The beam partially leaves the loop (46) at each cycle and partially continues looping. A beam (44) with multiple delays leaving from the loop (46) is caused to interfere with a beam (56) that is another part of the incident beam (20) without delay, to create an output beam (60). The intensity of output beam (60) is affected by multiple delays caused by the loop (46), and depends on the coherence length of the incident beam (20). Therefore, the coherence length of the incident beam (20) can be obtained by detecting the intensity of output beam (60). When the coherence length of light is sufficiently large, by setting the resultant intensity of output beam (60) to be zero, the interferometer can also be used for high speed switching of laser light, based on a transient phenomenon.
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Healy Brian
Kowa Company Ltd.
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