| 摘要 |
PURPOSE:To prevent the number of temperature adjustment circuits stabilizing local stimulating sections from being increased in response to an increase in the number of local stimulated light sections in the coherent FDM optical receiver having plural local stimulation sections. CONSTITUTION:A common temperature adjustment circuit (TAJ) 3 is provided to local stimulating sections (LLG) 2-1-2-n each having a different wavelength variable range, and the TAJ 3 monitors the LLG 2-1-2-n in time division and implements temperature adjustment and each of stabilized local stimulated lights is synthesized by an optical multiplexer (MPX) 4 and the result is given to a 1st photodetector (FLD) 6 with an optical input signal 5 and a beat signal obtained thereat is given to a 2nd photodetector (SLD) 7, from which a base band signal 8 is obtained. |
