Abstract
A scheme for generating wideband optical frequency comb (OFC) is proposed and experimentally investigated based on a master-slave system. In such a system, a tunable optical resource and a distributed feedback semiconductor laser are utilized as master lasers (MLs), and their outputs provide dual optical injection (DOI) into a slave laser (SL) which is a 1550 nm multi-transverse mode vertical-cavity surface-emitting laser (1550 nm-VCSEL) operating at gain-switched state. For the 1550 nm-VCSEL biased at a relatively high current, two low-order transverse modes LP 01 and LP 11 can simultaneously lase and possess comparable powers. After loaded a large signal modulation, the 1550 nm-VCSEL can be driven into gain-switched state, and two separated sub-combs originating from two transverse modes can be generated. Through further introducing DOI to the gain-switched 1550 nm-VCSEL, the two sub-combs can link up to form an overall OFC under suitable operation parameters. The experimental results show that, through selecting optimized operating parameters, the bandwidth of the integral OFC within 10 dB amplitude variation can achieve 150.0 GHz. Additionally, the effects of the wavelengths of the two injection lights on the bandwidth of the overall OFC are also analyzed.
Highlights
The globalization of information has led to a continuous increase of communication data and brought a tremendous pressure on existing optical networks
For the slave laser (SL) biased at 10.30 mA, the optical spectrum (Fig. 2(b)) shows that there are two strong peaks located at 1547.952 nm and 1547.240 nm, which belong to LP01 and LP11 modes, respectively
We take two cases of Pm = 15.00 dBm and Pm = 20.00 dBm as two examples to discuss the performances of the optical frequency comb (OFC) generated by the gain-switched SL under dual optical injection (DOI)
Summary
The globalization of information has led to a continuous increase of communication data and brought a tremendous pressure on existing optical networks. The associate editor coordinating the review of this manuscript and approving it for publication was San-Liang Lee. multi-carrier spectrally efficient transmission techniques, such as optical orthogonal frequency division multiplex (OFDM) [2]–[4], coherent wavelength division multiplexing (WDM) [5], WDM passive optical network (WDM-PON) [6], [7], and Nyquist WDM [8] etc. In multi-carrier transmission systems, an optical frequency comb (OFC) source is a key component. An OFC is an optical spectrum composed of a series of equi-spaced discrete spectral lines [9].
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