Bandwidth-enhanced volume grating for dense wavelength-division multiplexer using a phase-compensation scheme

Lanlan Gu, Xiaonan Chen, Zhong Shi, Brie Howley, Jian Liu, Ray T. Chen
2005 Applied Physics Letters  
A phase-compensation scheme is proposed and demonstrated to overcome the intrinsic tradeoff between the dispersion and the bandwidth of a volume grating. Its application to a volume grating-based dense wavelength-division multiplexing ͑DWDM͒ device is explored. A DWDM device is fabricated by using a 45°/82°configuration. To achieve phase compensation of the Bragg condition, a wavelength-dependent incident angle for a dispersion-enhanced holographic grating at 82°is generated through a prestaged
more » ... volume hologram at 45°. The 3 dB dispersion bandwidth is increased five times by using such a device configuration. A 21-channel DWDM device centered at 1555 nm with 200 GHz spacing is demonstrated within its 3 dB bandwidth.
doi:10.1063/1.1921333 fatcat:nwcwxrusnvhqjn3wc72xtvn6me