All-optical UWB generation and modulation
using SOA-XPM effect and DWDM-based
multi-channel frequency discrimination
Fei Wang,
1, 2
Jianji Dong,
1
Enming Xu,
1
Xinliang Zhang
1, *
1
Wuhan National Laboratory for Optoelectronics & School of Optoelectronic Science and Engineering, Huazhong
University of Science and Technology, Wuhan, 430074, P. R. China.
2
School of optoelectronic information, Chongqing University of Technology, Chongqing 400050, P. R. China.
*xlzhang@mail.hust.edu.cn
Abstract: An all-optical UWB pulses generation and modulation scheme
using cross phase modulation (XPM) effect of semiconductor optical
amplifier (SOA) and DWDM-based multi-channel frequency discrimination
is proposed and demonstrated, which has potential application in multiuser
UWB-Over-Fiber communication systems. When a Gaussian pulse light and
a wavelength-tunable CW probe light are together injected into the SOA, the
probe light out from the SOA will have a temporal chirp due to SOA-XPM
effect. When the chirped probe light is tuned to the slopes of single DWDM
channel transmittance curve, the optical phase modulation to intensity
modulation conversion is achieved at DWDM that serves as a multi-channel
frequency discriminator, the inverted polarity Gaussian monocycle and
doublet pulse is detected by a photodetector, respectively. If the probe lights
are simultaneously aimed to different slopes of several DWDM channels,
multi-channel or binary-phase-coded UWB signal generation can be
acquired. Using proposed scheme, pulse amplitude modulation (PAM), pulse
polarity modulation (PPM) and pulse shape modulation (PSM) to UWB
pulses also can be conveniently realized.
©2010 Optical Society of America
OCIS codes: (060.2330) Fiber optics communications; (060.5625) Radio frequency photonics;
(999.9999) Ultra-wide band; (250.4745) Optical processing devices.
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Received 25 Aug 2010; revised 7 Oct 2010; accepted 12 Oct 2010; published 10 Nov 2010
22 November 2010 / Vol. 18, No. 24 / OPTICS EXPRESS 24588