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

Lanlan Gu; Xiaonan Chen; Zhong Shi; Brie Howley; Jian Liu; Chen, Ray T.
May 2005
Applied Physics Letters;5/2/2005, Vol. 86 Issue 18, p181103
Academic Journal
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 (DWDM) 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 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.


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