| 摘要 |
PURPOSE:To eliminate heat emission and to reduce the size of an optical receiver by dividing the optical receiver into a front end part which converges and mixes laser beam components of two frequencies and transmits the mixed beam through an optical fiber cable and a rear end part which detects and measures the difference between the two frequencies and generates a signal. CONSTITUTION:The optical receiver consists of the front end part 31 and rear end part 33, which are connected by the optical fiber 35. Two frequency beams which return from an interferometer (not shown in figure) pass through a converging lens 32 and then pass through a mixing polarizer 34 which mixes those beam components, generating amplitude-modulated light of the difference frequency. The rear end part 33 focuses the light exiting from the optical fiber 35 on a detector photodiode 37 including an amplifier 38 and a line driver 39. Then the detector circuit generates a signal to be sent to an electronic measuring instrument which is not shown in a figure. Consequently, the front end part 31 of the optical receiver generates no heat and the size is reduced.
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