摘要
提出了基于复合型耦合器的透射式GT腔,并将其串入马赫-曾德尔干涉仪(MZI)的两臂上,得到了一种新型的交错复用器。推导了该器件的理论表达式,并进行了数值模拟。模拟结果表明,该交错复用器具有相当好的通带平坦性,大的通带带宽、截止度和阻带带宽。对该交错复用器进行了优化分析,发现腔数固定时,纹波带宽比越大(频谱越接近矩形方波),隔离度将越小。分析结果表明,可以通过增加腔的数量来解决纹波带宽与隔离度的矛盾,即交错复用器的频谱性能随着腔数的增加得以改善。相对于环形谐振腔辅助的交错复用器,该交错复用器不需要添加额外的相移器就能获得近似矩形的频谱,并且在整个工作波段范围具有很好的频谱均匀性。对于该器件的色散问题,提出了采用级联环形腔作为色散补偿器的补偿方案。模拟结果表明,级联环形腔能够很好地补偿该交错复用器的色散。
The transmissive Gires-Tournois etalon （GTE） is proposed based on composite couplers.By combining such GTEs with Mach-Zehnder interferometer （MZI）,we obtain a new interleaver.The output expression is derived and numerical simulation is performed.The simulation indicates that it has good passband flatness （flat-top）,large isolation,wide passband and stopband bandwidths.By optimizing the spectrum it shows that when the sum of cavities of GTEs is fixed,the larger the passband bandwidth gets,the smaller the isolation will be,i.e.,isolation and bandwidth are incompatible.However,this contradiction can be overcome by increasing the sum of cavities,i.e.,interleaver′s spectral performance can be enhanced by increasing cavities.Compared with the ring resonator assisted interleaver,the proposed interleaver can achieve rectangle spectrum without using the phase shifter and its spectrum is uniform in the whole wavelength band.Further more,a set of cascaded ring resonators is proposed as the dispersion compenastor to overcome the dispersion of the interleaver.Dispersion compensation ability is very good and can be enhanced by increasing the number of ring resonators.
出处
《激光与光电子学进展》
CSCD
北大核心
2010年第7期75-82,共8页
Laser & Optoelectronics Progress
基金
福建省新世纪优秀人才项目(X07204)
福建省教育厅科技项目(JA08138)资助课题
关键词
光通信
交错复用器
马赫-曾德尔干涉仪
透射式GT腔
频谱优化
色散补偿
optical communications
interleaver
Mach-Zehnder interferometer
transmissive Gires-Tournois etalon
spectrum optimization
dispersion compensation
