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Experimental Translucent-Oriented Routing for Dynamic Lightpath Provisioning in GMPLS-Enabled Wavelength Switched Optical Networks

機(jī)譯：啟用GMPLS的波長(zhǎng)交換光網(wǎng)絡(luò)中用于動(dòng)態(tài)光路配置的面向?qū)嶒?yàn)的半透明路由

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In the evolution from opaque networks, using 3R regenerators and OEO conversions for every wavelength channel, towards transparent networks, relying on end-to-end all-optical connections, translucent networks is considered as an intermediate step. A translucent network is a cost-efficient infrastructure between opaque and transparent networks, that aims at attaining an adequate trade-off between network construction cost (i.e., due to the high cost of 3R regenerators) and the service provisioning performance (i.e., end-to-end optical signal quality). This article addresses the dynamic provisioning of connections within a GMPLS-enabled translucent wavelength switched optical network with sparse 3R regenerators. To this end, translucent-oriented GMPLS protocol extensions are proposed to, on the one hand, disseminate required per node regenerator availability and OSNR-related link and node attributes and, on the other hand, allocate regenerator resources when setting up connections. An on-line OSNR-based impairment-aware RWA algorithm is devised to compute routes aiming at satisfying two constraints: the wavelength continuity constraint and the end-to-end optical signal quality. If either constraint cannot be satisfied, available regenerators along the route are used. To the best of our knowledge, the novelty and progress of this work is that, for the first time, both the proposed translucent GMPLS protocol enhancements and the performance of the RWA algorithm are combined within an experimental control plane network scenario (CTTC's ADRENALINE testbed). This allows validating and evaluating the feasibility of the described translucent GMPLS routing strategy when being potentially deployed into real WSON networks. Several configurations with numbers of 3R regenerators and wavelength channels per link, are experimentally evaluated and compared mainly in terms of the connection blocking probability. Although concrete details about the measured average setup delay are al-nso discussed.
機(jī)譯：在從不透明網(wǎng)絡(luò)向每個(gè)波長(zhǎng)通道使用3R再生器和OEO轉(zhuǎn)換到透明網(wǎng)絡(luò)的過(guò)程中，依靠端到端的全光連接，半透明網(wǎng)絡(luò)被視為中間步驟。半透明網(wǎng)絡(luò)是不透明和透明網(wǎng)絡(luò)之間的一種經(jīng)濟(jì)高效的基礎(chǔ)架構(gòu)，其目的是在網(wǎng)絡(luò)建設(shè)成本（即由于3R再生器的高昂成本）與服務(wù)供應(yīng)性能（即終端服務(wù)）之間取得適當(dāng)?shù)恼壑?。端光信?hào)質(zhì)量）。本文介紹了在具有稀疏3R再生器的啟用GMPLS的半透明波長(zhǎng)交換光網(wǎng)絡(luò)中動(dòng)態(tài)配置連接的方法。為此，提出了面向半透明的GMPLS協(xié)議擴(kuò)展，以便一方面分發(fā)每個(gè)節(jié)點(diǎn)再生器可用性和與OSNR相關(guān)的鏈路和節(jié)點(diǎn)屬性所需的信息，另一方面，在建立連接時(shí)分配再生器資源。設(shè)計(jì)了一種基于OSNR的在線損傷感知RWA算法，旨在滿足兩個(gè)約束條件：波長(zhǎng)連續(xù)性約束條件和端到端光信號(hào)質(zhì)量。如果不能滿足任何一個(gè)約束，則使用沿路徑的可用再生器。據(jù)我們所知，這項(xiàng)工作的新穎性和進(jìn)步之處在于，首次將建議的半透明GMPLS協(xié)議增強(qiáng)功能和RWA算法的性能都結(jié)合到了實(shí)驗(yàn)控制平面網(wǎng)絡(luò)場(chǎng)景中（CTTC的ADRENALINE測(cè)試平臺(tái)） 。當(dāng)潛在地將其部署到實(shí)際WSON網(wǎng)絡(luò)中時(shí)，這允許驗(yàn)證和評(píng)估所描述的半透明GMPLS路由策略的可行性。實(shí)驗(yàn)評(píng)估并比較了每條鏈路具有3R再生器數(shù)量和波長(zhǎng)通道的幾種配置，并主要根據(jù)連接阻塞概率進(jìn)行了比較。盡管還討論了有關(guān)所測(cè)量的平均建立延遲的具體細(xì)節(jié)。

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