Multiplexing of millimeter-wave signals for fiber-radio links by direct modulation of a two-mode locked Fabry-Pe/spl acute/rot laser
Multiplexing of millimeter-wave signals for fiber-radio links by direct modulation of a two-mode locked Fabry-Pe/spl acute/rot laser
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DOI：
10.1109/tmtt.2003.821913
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发表时间：
2004-02
影响因子：
4.3
通讯作者：
M. Ogusu;K. Inagaki;Y. Mizuguchi;T. Ohira
中科院分区：
文献类型：
--
作者：
M. Ogusu;K. Inagaki;Y. Mizuguchi;T. Ohira
本文介绍了一种用于光纤无线电系统的毫米波段多路复用信号的产生方法，该方法采用一个双模锁模的法布里-珀罗（Fabry-Pe）/脉冲激光器（FP）从激光器，其注入电流由信号源直接调制。我们定性地考虑了FP从激光器的毫米波信号的失真。毫米波段的畸变分量是由锁模调制和FP激光器的非线性调制响应引起的。研究了锁定FP激光器的双音调制，以评估毫米波信号对二阶和三阶失真分量的动态范围。我们还执行三个156-Mb/s-BPSK信号在60 GHz频段上的光纤传输，以演示光纤无线电下行链路系统。讨论了下行链路系统的总容量。此外，提出了两种在毫米波段产生多载波的方法。由这些方法支持的多载波发生器可以用作上行链路毫米波信号的本地信号。第一种方法是基于FP从激光器的多音调制。我们尝试使用毫米波本地信号下变频的52-Mb/s的ASK信号在60 GHz的频带。第二种方法依赖于通过使用单个连续波信号对FP从激光器的失真调制，其中FP激光器的注入电流的DC偏置电平部分地低于阈值。我们确认，通过使用第二种方法，有效地产生在60 GHz频段上的五个载波。进一步研究了色散效应对毫米波本振信号的影响。
In this paper, we introduce generation of multiplexed signals on the millimeter-wave bands for fiber-radio systems where an optical millimeter-wave generator is based on a two-mode locked Fabry-Pe/spl acute/rot (FP) slave laser, whose injection current is directly modulated by a signal source. We qualitatively consider the distortion of the millimeter-wave signals from the FP slave laser. The distortion components on the millimeter-wave bands are induced from the simultaneous modulation of the locked modes and the nonlinear modulation response of the FP laser. Two-tone modulation of the locked FP laser is examined to evaluate the dynamic range of the millimeter-wave signals against the second- and third-order distortion components. We also perform fiber transmission of three 156-Mb/s-BPSK signals on the 60-GHz band to demonstrate fiber-radio down-link systems. The total capacity of the down-link system is discussed. In addition, two methods for multicarrier generation on the millimeter-wave bands are proposed. Multicarrier generators supported by these methods can be used as local signals for up-link millimeter-wave signals. The first method is based on multitone modulation of the FP slave laser. We attempt the down-conversion of a 52-Mb/s ASK signal on the 60-GHz band by using the millimeter-wave local signals. The second method depends on the distorted modulation of the FP slave laser by using a single continuous wave signal where the DC-bias level of the FP laser's injection current is partly under the threshold value. We confirm that five carriers on the 60-GHz band are effectively generated by using the second method. Furthermore, the influences of the chromatic dispersion effects on the millimeter-wave local signals are investigated for both methods.