Awg is a crucial component in dense - wavelength - demulti / multiplex ( dwdm ) all - optical - network ( aon ) . at present , the commercial awg is on sale oversea , however , the domestic researches are not at high - level . awg at home does not make any significant breakthrough in experiments Awg是dwdm全光网络系统中的关键器件,目前国外已有产品出售,但国内的研究水平不高,以理论工作居多,在实验结果上没有取得突破性的成果。
The technique of fiber grating made the research , manufacture and integration of all optical fiber devices possible , so fiber grating will act an important part in aon . the applications have caused people ' s great interest and enthusiasm such as optical switch , optical add / drop multiplexer , and optical fiber ' s dispersion compensator , etc . using transfer matrix method and procedure of numerical analysis , the paper analyze theoretically that how grating ' s parameters influence sampled gratings " reflective spectrum 光纤光栅技术使得全光纤器件的研制和集成成为可能,故光纤光栅将在全光网中扮演十分重要的角色,它在光开关、光的分插复用、光纤的色散补偿等关键技术中的应用已引起人们的极大兴趣和研究热情。
However , the pon has not been fully developed and the cost is also very high before the large - scale use . the main technology that is used to construct the optical access network is aon ( active optical network ) . the article frist introduces the structure , classification and multiplexing technologies of oan 其中无源光网络pon技术发展更快些,然而由于无源光网络pon技术还不成熟,在没有形成规模应用之前,成本还是较高,因此当前实现光接入网还是以采用有源光接入网技术为主。
" during summer this year , eleven mentees successfully obtained their internships directly through this mentorship programme . they either worked at the companies where the mentors were or obtained the posts at other companies recommended by the mentors . these companies include pricewaterhousecoopers , caltex companies ( greater china ) ltd . , aon hong kong limited , campbell soup asia ltd . , li & fung ( trading limited ) ; a - world communications ltd . , bank of east asia and sun hung kai properties ltd . " continued mr lee 李先生续称:今年夏天,共有十一名同学成功地透过这个计划直接获得暑期实习的机会,他们于学长任职的机构工作,或在学长的介绍下在其他公司工作,这些机构包括罗兵咸永道有限公司、加德士石油(大中华)集团有限公司、怡安亚洲集团、金宝汤亚洲有限公司、利丰有限公司、 a - worldcommunicationslimited 、东亚银行有限公司及新鸿基地产发展有限公司。