CAJ | 학술논문

三端口可调谐滤波器是全光智能交换网络和密集波分复用系统中的核心器件。其反射端口的光谱特性，尤其是反射率和信道隔离度对于滤波器的性能至关重要。角度调谐滤光片因其良好的矩形度和温度稳定性被广泛应用于三端口可调谐滤波器的制备，其反射端口的光谱特性不仅与倾斜入射角度的大小有关，而且与其非平行端面间的楔角参量有关。文章详细分析了楔角参量对非平行角度调谐滤光片的反射率及半宽的影响，仿真计算了楔角参量在不同极性和大小条件下角度调谐滤光片的反射光谱特性，揭示了保持适当的楔角参量和方向性可以改善倾斜入射状态下滤光片的反射光谱特性。设计并制备了楔角为0.8°的楔形角度调谐滤光片，实验证明了当保持楔角方向与倾斜入射方向相同时会严重的劣化透反射光谱的半宽和隔离度，方向相反时则可以改善反射光谱的反射率和半宽指标。通过负楔角参量的引入使得角度调谐滤光片较之高平行度的同类器件具有更高的反射率和信道隔离度。
삼단구가조해려파기시전광지능교환망락화밀집파분복용계통중적핵심기건。기반사단구적광보특성，우기시반사솔화신도격리도대우려파기적성능지관중요。각도조해려광편인기량호적구형도화온도은정성피엄범응용우삼단구가조해려파기적제비，기반사단구적광보특성불부여경사입사각도적대소유관，이차여기비평행단면간적설각삼량유관。문장상세분석료설각삼량대비평행각도조해려광편적반사솔급반관적영향，방진계산료설각삼량재불동겁성화대소조건하각도조해려광편적반사광보특성，게시료보지괄당적설각삼량화방향성가이개선경사입사상태하려광편적반사광보특성。설계병제비료설각위0.8°적설형각도조해려광편，실험증명료당보지설각방향여경사입사방향상동시회엄중적열화투반사광보적반관화격리도，방향상반시칙가이개선반사광보적반사솔화반관지표。통과부설각삼량적인입사득각도조해려광편교지고평행도적동류기건구유경고적반사솔화신도격리도。
Three‐port tunable optical filter is a key device in the all‐optic intelligent switching network and dense wavelength divi‐sion multiplexing system .The characteristics of the reflecting spectrum ,especially the reflectivity and the isolation degree are very important to the three‐port filter .Angle‐tuned thin film filter is widely used as a three‐port tunable filter for its high rectan‐gular degree and good temperature stability .The characteristics of the reflecting spectrum are greatly influenced not only by the incident angle ,but also by the wedge angle parameter of the non‐paralleled wedge thin film filter .In the present paper ,the influ‐ences of the wedge angle parameter to the reflectivity and the half bandwidth are analyzed ,and the reflecting spectrum character‐stics are simulationed in different wedge angle parameter and polarity .The wedge angle‐tuned thin film filter with 0.8° wedge angle parameter is fabricated .The experimental results show that keeping the wedge angle the same orientation to the incident angle will worsen the reflectivity and the rectangular degree of the reflecting spectrum .However ,keeping the wedge angle orien‐tation reverse to the incident angle will enhance the reflectivity and decrease the bandwidth ,which will give higher reflectivity and isolation degree to the three‐port filter than that of high parallel degree angle‐tuned thin film filter .