Dual-band balun has the advantages of high input impedances at two separate bands. 因为双频巴伦具有高输入阻抗的特性于某两个频带上。
In order to study the optical feedback characteristics at the dual frequency laser, a birefringent external cavity was studied throughboth theoretical analysis and experiments. 摘要为了研究双频激光器的光回馈特性，采用双折射外腔光回馈的方法，进行了理论分析和实验验证，取得了双频激光器中条纹倍频现象的数据。
