公开(公告)号：KR1020030050465A

公开(公告)日：2003-06-25

申请号：KR1020010080895

申请日：2001-12-18

Applicant: 한국전자통신연구원

Inventor： 김봉규 ,  김광준 ,  김병성 ,  김해근

IPC: H04J14/02

CPC classification number: H04B10/572 ,  H01S5/0687 ,  H01S5/4087 ,  H04B10/506 ,  H04J14/02

Abstract: PURPOSE: A multiwavelength fixing method and apparatus using an acousto-optic tunable filter is provided to reduce a signal noise due to a pilot signal by applying the pilot signal to an acousto-optic wavelength filter with different transmission wavelength and frequency conversion according to frequency of an acoustic wave. CONSTITUTION: Lights with different optical frequencies outputted from a light source are multiplexed by a multiplexer(12) and applied to a WDM(Wavelength Division Multiplexing)(10). The multiplexed optical signals are partially transmitted to a transmission system and partially to an acousto-optic tunable filter(14) for multiwavelength fixing. An etalon filter(16) has different transmission characteristics according to a wavelength, so that even if a light with a strength is inputted, the light is outputted with a different strength according to wavelength. An optical divider(15) divides a light into two to use one to measure a light strength and input the other to the etalon filter(16), thereby measuring strength and wavelength of inputted light. Two optical detectors(18,19) detect electrical signals and inputs them to a band pass filter(22). The band pass filter(22) passes only a required specific frequency of plural frequencies included in the inputted light and removes the other remaining frequencies than the specific frequency. A wavelength controller(21) detect wavelength information on corresponding optical frequency by optical frequencies of each light source(11) by using the electric signals with the wavelength detected by the optical detectors(18,19), and compares the detected wavelength information and a desired wavelength of the light source(11). If there is a difference between the two wavelengths, the wavelength controller(21) changes an environmental condition of the light source(11) to obtain the desired wavelength.

Abstract translation: 目的：提供一种使用声光可调谐滤波器的多波长固定方法和装置，以通过将导频信号应用于具有不同传输波长和频率转换的声光波长滤波器，以根据导频信号的频率来减少由于导频信号引起的信号噪声 声波。 构成：从光源输出的具有不同光频率的光由多路复用器（12）复用并施加到WDM（波分复用）​​（10）。 复用的光信号被部分地传输到传输系统并且部分地传输到用于多波长固定的声光可调谐滤波器（14）。 标准具过滤器（16）根据波长具有不同的透射特性，使得即使输入具有强度的光，根据波长以不同的强度输出光。 光分路器（15）将光分成两个，以使用一个来测量光强度，并将另一个光输入到标准具滤光器（16），从而测量输入光的强度和波长。 两个光学检测器（18,19）检测电信号并将其输入到带通滤波器（22）。 带通滤波器（22）仅通过包含在输入的光中的所需的多个频率的特定频率，并且去除比特定频率的其它剩余频率。 波长控制器（21）通过使用由光检测器（18,19）检测到的波长的电信号来检测每个光源（11）的光频率的相应光频率的波长信息，并将检测到的波长信息和 光源（11）的期望波长。 如果两个波长之间存在差异，则波长控制器（21）改变光源（11）的环境条件以获得期望的波长。