| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 92 === Abstract
In this thesis, we design optical add/drop multiplexer (OADM) and study its applications in metropolitian area networks and/or DWDM subsystem. We propose a network architecture using -cell architecture to realize all optical networks architecture, in which the crucial modules of OADMs and optical cross-connects (OXCs) are implemented. Both of them make the network much more flexible and simple then ever. We introduce an example of “Double Ring -cell WDM network” to examine that OADM is indeed an importance part in the -cell architecture.
For investigation of OADMs, we integrated them with fiber Bragg gratings (FBGs) and some related optical components such as optical circulators and 1xN optical switches. To prevent the crosstalk and reflection by home made FBGs, the FBGs have high reflectivity of 99.9% and low side lobes. The FBGs also be temperature compensated to avoid them from wavelength misalignment with the corresponding laser source. Temperature coefficient before and after temperature compensated is 15 pm/℃ and 0.7 pm/℃, respectively. The four kinds of OADMs we made are: (1) Two identical OADMs module with the same four channels of 1542.4 nm,1545.6 nm,1547.1 nm and 1552.3 nm and as an add-drop pair in the optical network, (2) a 4-Ch reconfigurable OADM with insertion loss, intrachannel crosstalk and channel spacing of 5 dB, 25 dB and 1.6 nm, respectively, (3) a power compensated OADM with net gain of 5 dB (i.e., virtual insertion loss of 5 dB!) for the pass-through channel, and (4) a bi-directional OADM with 45 dB isolation for either direction. Finally, we conclude our achievements in thesis and suggested future works.
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