Design and analysis of broadband single-mode photonic crystal fiber for transmission windows of the telecom wavelengths

To analyse the convenient use of photonic crystal fiber in the communication windows, a broadband single-mode photonic crystal fiber is proposed based on index-matching resonant coupling by using the full vector finite-element method. The novel microstructured design has been achieved for a wavelength range of 1.3 μm-1.6 μm. Thus it provides a wide operational bandwidth of 300 nm. This bandwidth covers all the transmission windows of fiber-optic communication except that of 'first window'. The higher order mode resonant coupling losses of the proposed fiber are good enough within this wavelength range to maintain the single mode operation. The mode field area for the proposed fiber in straight and as well as bent state is enough such that the fiber can reduce the optical intensities, which makes the fiber to be useful in high power fiber lasers and the amplifier applications. The proposed fiber exhibits a very small fundamental mode loss below 10−3 dB/m both in the straight and bent state. Moreover, the broadband design which covers the most widely used second and third communication windows of wavelengths around 1310 nm and 1550 nm respectively, will draw the attention of the manufacturer in the fiber optic communication.