发明名称 |
CENTER WAVELENGTH STABILIZING DEVICE FOR OPTICAL FILTER |
摘要 |
PROBLEM TO BE SOLVED: To provide a center wavelength stabilizing device for an optical filter having a wide control band to make a center wavelength of the optical filter used for a cross connector and coping with a wide band noise in an input light. SOLUTION: The center wavelength stabilizing device 3 is made up of an optical distributor 4, a photo detector 5, a multiplier 6, an oscillator 7, and a control circuit 8. The oscillator 7 modulates an output wavelength of light sources 231 -23M. A CW light of one wavelength selected by a wavelength variable filter 2811 branches part of intensity at an optical distributor 4 and given to a photo detector 5, in which the signal is converted into an electric strength signal. The electric strength signal is synchronously detected with a modulation signal from the oscillator 7 at the multiplier 6 and demodulated. The signal is an error signal in response to a relative wavelength error between a transmission center wavelength of the wavelength variable filter 2811 and an output wavelength from the light source 231 . The control circuit 8 processes the error signal and applies negative feedback to the processed signal to the variable filter 2811 to act like a loop making the relative wavelength error zero. |
申请公布号 |
JPH09247125(A) |
申请公布日期 |
1997.09.19 |
申请号 |
JP19960047434 |
申请日期 |
1996.03.05 |
申请人 |
NIPPON TELEGR & TELEPH CORP <NTT> |
发明人 |
TEJIMA MITSUHIRO;KOGA MASABUMI |
分类号 |
H04J14/00;H04B10/07;H04B10/2507;H04B10/27;H04B10/291;H04B10/516;H04B10/61;H04J14/02 |
主分类号 |
H04J14/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|