Optical channel drop filter (OCDF) plays a key role in optical communication networks for filtering the individual wavelength among the group of channels in wavelength division multiplexing systems. There are several channel drop filters with different design mechanisms available in the literature, but those structure dimensions are not compact enough for the photonic integrated applications. Hence, in this paper, a compact and efficient OCDF is developed in the triangular lattice PC structure based on diamond-shaped photonic crystal ring resonator (PCRR) mechanism combined with micro cavity resonator (MCR). The developed OCDF is analysed for different operating wavelengths by considering the different positions of MCR around the main PCRR. Based upon the position of the MCR around PCRR, the three dropping wavelengths such as 1540 nm, 1550 nm, and 1570 nm are observed at the output waveguides with 100% dropping efficiency. Then the structural and performance parameter comparison is done between the proposed and existing structures in terms of device dimension, dropping efficiency, and quality factor. It is depicted through the results that the quality factor and the device dimension are better than that of the existing structures for 1550-nm wavelength.

在波分复用系统中，光信道降滤器（OCDF）在光通信网络中起着关键作用，用于过滤信道组中的各个波长。在文献中有几种具有不同设计机制的通道下降滤波器，但是这些结构尺寸对于光子集成应用来说不够紧凑。因此，在本文中，基于菱形光子晶体环形谐振器（PCRR）机制与微腔谐振器（MCR）的结合，在三角晶格PC结构中开发了紧凑高效的OCDF。通过考虑主PCRR周围MCR的不同位置，对开发的OCDF进行不同工作波长的分析。根据MCR在PCRR周围的位置，三个下降波长（例如1540 nm，1550 nm，在输出波导处观察到1570 nm和1570 nm的光，下降效率为100％。然后，根据器件尺寸，投掷效率和品质因数，对提议的结构和现有的结构进行结构和性能参数比较。结果表明，对于1550 nm波长，质量因子和器件尺寸要优于现有结构。