Title:
OPTICAL PULSE SIGNAL DELAY DEVICE
Document Type and Number:
Japanese Patent JPH03280024
Kind Code:
A
Abstract:
PURPOSE:To delay an optical pulse signal by a set time and to compensate the loss of an optical signal by providing an optical switch which can switch the optical path between an input and an output terminal, an optical fiber for delay, an optical amplifying element which is interposed halfway, and a timing control part which sets a delay time. CONSTITUTION:The delay device is equipped with the optical switch 23 which can switch the optical path between the input and output terminals, the optical fiber 36 for delay which is coupled between the input and output terminals, the optical amplifying element 32 which is interposed halfway, and the timing control part 26 which sets the delay time by outputting the switching control signal for the optical switch 23. Namely, the input optical pulse signal passes through the delay fiber 36 and returns to the other light input terminal. Namely, when the optical path is switched again right before the light returns, optical pulses are confined to the delay fiber and in the case of the lapse by the number of times of confinment set by a timing control part 26, the optical pulses are outputted from the light output terminal. The loss of light in the period is compensated by an optical amplifying element 32. Consequently, an optional delay time can be set by the simple constitution and the device which is free from the loss of the optical signal at the time of delay is obtained.
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Inventors:
HIRANO ISUKE
Application Number:
JP8283290A
Publication Date:
December 11, 1991
Filing Date:
March 29, 1990
Export Citation:
Assignee:
HAMAMATSU PHOTONICS KK
International Classes:
G02B6/00; G02F3/00; (IPC1-7): G02B6/00; G02F3/00
Attorney, Agent or Firm:
Toshiaki Furusawa (1 outside)