The modulation bandwidth and the relaxation oscillation frequencies of the laser are quite different at different injection powers and wavelengths 發(fā)現(xiàn)在不同的注入光強度和波長下,激光器的調制帶寬和弛豫振蕩峰頻率會發(fā)生變化。
Only when the length of ring cavity is below that value , relaxation oscillation happens , and frsl have good modulation response and large modulation bandwidth 只有當環(huán)形腔長度小于該臨界值時,激光器才發(fā)生弛豫振蕩,并具有理想的調制響應和大的調制帶寬。
And the waveform of the transmitted signals was designed based on the target distance ( 5 ~ 50m ) . the waveform is triangular fmcw with central frequency at 6ghz , modulation bandwidth 100mhz , modulation period 10 s , step frequency 0 . 2mhz , and step time 10ns 在此基礎上,設計發(fā)射信號波形參數(shù)為三角形調頻連續(xù)波,中心頻率6ghz ,調制帶寬100mhz ,調制周期10 s ,步進頻率0 . 2mhz ,步進時間10ns 。
On the basis of rate equations of frsl , power characteristics and extinction ratio of the converted light are discussed . the relation between relaxation oscillation , small - signal modulation response , modulation bandwidth and the length of fiber ring cavity is analyzed also 根據(jù)frsl滿足的單模速率方程,討論了采用frsl進行波長轉換時轉換光的功率特性和消光比,以及frsl的弛豫振蕩特性、小信號調制響應、調制帶寬與光纖環(huán)形腔長度的關系。
It has been shown by our calculations that conductor loss is greatly reduced under velocity matching with relatively thick coplanar waveguide electrodes and thick buffer layer , but the characteristic impedance can not match with that of the external circuit at the same time , and the modulation bandwidth is confined in this case 然后,用一般的橢圓積分計算了普通共面波導型調制器的有效折射率、特征阻抗和導體損耗系數(shù)。通過計算發(fā)現(xiàn),采用厚電極和厚緩沖層結構,在實現(xiàn)速度匹配的情況下,可以大大減小導體損耗,但是由于阻抗不能同時滿足匹配,調制帶寬受到限制。