Abstract
Directly modulated tunable lasers are highly desirable for constructing dense-wavelength division multiplexing (DWDM) access networks, owing to their advantages of low cost, compact size and low power consumption. However, the transmission distance for 10 Gbps is usually limited to about 10 km in the telecom C-band in standard single-mode fiber (SMF) due to wavelength chirp. Here we propose and demonstrate a simple technique for extending the transmission distance by detuning the wavelength of a tunable V-cavity laser with respect to DWDM multiplexers. Experiment results show that 10 Gbps signal can be transmitted error-free (BER<10−12) over 20 km SMF with a wavelength-detuning with respect to a Gaussian-type arrayed waveguide grating (AWG) without dispersion compensation. The power penalty is only 1 dB compared to the back-to-back transmission.
Highlights
WDM passive optical networks (WDM-PON) are being upgraded from 2.5Gbps to 10Gbps to meet the rapid growth in internet traffic [1]
We propose and demonstrate a simple technique for extending the transmission distance by detuning the wavelength of a tunable V-cavity laser with respect to the arrayed waveguide grating (AWG) which is used as the multiplexer in the system
The V-cavity laser packaged in the form of SFP+ was directly modulated at 10 Gb/s with a 231−1 non-return-to-zero (NRZ) pseudo-random binary sequence (PRBS) signal generated by pulse pattern generator (PPG) in the BERT (Bit Error Rate Tester)
Summary
WDM passive optical networks (WDM-PON) are being upgraded from 2.5Gbps to 10Gbps to meet the rapid growth in internet traffic [1]. The generation PON (NG-PON2) provides a downstream transmission of 40Gbps and upstream transmission of 10Gbps and have been studied extensively in order to meet the future requirements of bandwidth. TDM/WDM-PON, considered as the most attractive technology of NG-PON2, was achieved via stacking 4 wavelengths, each with 10Gbps data rate in the upstream and 2.5 Gbps in the downstream. Tunable lasers are the most desirable candidate to construct WDM-PON fiber access networks in order to reduce costs of inventory management and for dynamic bandwidth allocation. In the 10 Gbps WDM PON systems, over at least 20 km fiber transmission is needed. For high-speed long-distance systems, electro-absorption modulator and Mach-Zehnder modulator are still the dominant choices
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