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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 4 — Feb. 25, 2013
  • pp: 4194–4204
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OpenSlice: an OpenFlow-based control plane for spectrum sliced elastic optical path networks

Lei Liu, Raül Muñoz, Ramon Casellas, Takehiro Tsuritani, Ricardo Martínez, and Itsuro Morita  »View Author Affiliations


Optics Express, Vol. 21, Issue 4, pp. 4194-4204 (2013)
http://dx.doi.org/10.1364/OE.21.004194


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Abstract

A control plane is a key enabling technique for dynamic and intelligent end-to-end path provisioning in optical networks. In this paper, we present an OpenFlow-based control plane for spectrum sliced elastic optical path networks, called OpenSlice, for dynamic end-to-end path provisioning and IP traffic offloading. Experimental demonstration and numerical evaluation show its overall feasibility and efficiency.

© 2013 OSA

1. Introduction

The spectrum sliced elastic optical path network, which is also known as the Elastic Optical Network (EON) or the flexible grid optical network, has been recently proposed to more efficiently utilize network spectrum resources [1

1. M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag. 47(11), 66–73 (2009). [CrossRef]

]. In an EON, optical spectrum ranges are adaptively allocated to an optical path according to the client (e.g. IP) traffic demand, modulation format and path attributes (e.g., physical length or optical impairments) [2

2. M. Jinno, B. Kozicki, H. Takara, A. Watanabe, Y. Sone, T. Tanaka, and A. Hirano, “Distance-adaptive spectrum resource allocation in spectrum-sliced elastic optical path network,” IEEE Commun. Mag. 48(8), 138–145 (2010). [CrossRef]

]. For dynamic and intelligent end-to-end optical path provisioning and IP traffic offloading in an EON, a control plane is a key enabling technique.

Therefore, a lot of studies have started to design a Generalized Multi-Protocol Label Switching (GMPLS)-based control plane for an EON [3

3. R. Muñoz, R. Casellas, and R. Martínez, “Dynamic distributed spectrum allocation in GMPLS-controlled elastic optical networks,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.4.

5

5. R. Casellas, R. Muñoz, J. M. Fàbrega, M. S. Moreolo, R. Martínez, L. Liu, T. Tsuritani, and I. Morita, “Experimental assessment of a combined PCE-RMA and distributed spectrum allocation mechanism for GMPLS elastic CO-OFDM optical networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper OM3G.1.

]. Despite massive progress, it should be noted that such studies mainly focused on the control of the optical layer. The recent studies [6

6. R. Martínez, R. Casellas, and R. Muñoz, “Experimental validation / evaluation of a GMPLS unified control plane in multi-layer (MPLS-TP/WSON) networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper NTu2J.1.

] have validated the application of a GMPLS-based unified control plane for controlling a multi-layer network composed of both packet (Multi-Protocol Label Switching Transport Profile (MPLS-TP)) and optical switching (Wavelength Switched Optical Network (WSON)) technologies. However, to the best of our knowledge, the specific GMPLS-based unified control for both IP and EON layers has not been addressed yet. More importantly, although more mature and intelligent, a GMPLS-based control plane may not be an ideal solution for the deployment in a real operational scenario due to its distributed nature and high complexity, especially for a unified control functionality in IP and optical multi-layer networks [7

7. A. Farrel, “A unified control plane: dream or pipedream,” presented at the 6th International Conference on IP + Optical Network (IPOP 2010), Tokyo, Japan, 10–11 Jun., 2010. http://www.pilab.jp/ipop2010/info/onlineproceedings.html.

9

9. L. Liu, T. Tsuritani, I. Morita, H. Guo, and J. Wu, “OpenFlow-based wavelength path control in transparent optical networks: a proof-of-concept demonstration,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.2.

].

The rest of this paper is organized as follows. Section 2 proposes the technical details for OpenSlice, including network architecture, OpenFlow protocol extensions, and the procedure for end-to-end path provisioning by using the OpenSlice. Section 3 presents the experimental demonstration and performance evaluations of the OpenSlice. Section 4 concludes this paper by summarizing our contributions and discussing directions for our future works.

2. OpenSlice: architecture and protocols

2.1 Network architecture

Figure 1
Fig. 1 Multi-flow OTP [15, 16] with OpenSlice extensions.
and Fig. 2
Fig. 2 Bandwidth variable WXC [1] with OpenSlice extensions.
show the proposed network architecture. In order to connect IP routers to an EON with IP offloading capability, a Multi-flow Optical Transponder (MOTP) has been proposed [15

15. M. Jinno, Y. Sone, H. Takara, A. Hirano, K. Yonenaga, and S. Kawai, “IP traffic offloading to elastic optical layer using multi-flow optical transponder,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Mo.2.K.2.

] and demonstrated [16

16. H. Takara, T. Goh, K. Shibahara, K. Yonenaga, S. Kawai, and M. Jinno, “Experimental demonstration of 400 Gb/s multi-flow, multi-rate, multi-reach optical transmitter for efficient elastic spectral routing,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.A.4.

] recently. In a MOTP, a flow classifier at the transmitter side is deployed, to identify the packets of an incoming IP flow according to their destination addresses, virtual local area network tags, etc, and to split such flow into several sub-flows [15

15. M. Jinno, Y. Sone, H. Takara, A. Hirano, K. Yonenaga, and S. Kawai, “IP traffic offloading to elastic optical layer using multi-flow optical transponder,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Mo.2.K.2.

]. Before mapping each sub-flow to an appropriate optical transport unit, the flow classifier generates a Path Setup Request (PSR) for each sub-flow, containing not only the source/destination addresses, but also the bit rate of each sub-flow. This requires that the flow classifier is able to monitor or detect the bit rate for a flow, and the approach for this detection is beyond the scope of this paper.

The EON layer is configured with the Bandwidth Variable Wavelength Cross-Connects (BV-WXCs) [1

1. M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag. 47(11), 66–73 (2009). [CrossRef]

], which are implemented by using bandwidth variable wavelength selective switches (BV-WSS) [1

1. M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag. 47(11), 66–73 (2009). [CrossRef]

]. Both the MOTP and BV-WXC are extended with the OpenSlice functionality, which are referred to as OpenSlice-enabled MOTP (OF-MOTP) and BV-WXC (OF-BV-WXC), as shown in Fig. 1 and Fig. 2 respectively. A centralized controller is introduced to control all the IP routers through the standard OpenFlow protocol, and control all the OF-MOTPs and OF-BV-WXCs through the OpenSlice protocol. The controller implemented in this paper is based on NOX [17

17. “NOX: an OpenFlow controller,” http://noxrepo.org/.

]. For simplicity, we will still use NOX to represent our controller, but note that it is an extended controller from the original NOX enabled to support the OpenSlice protocol.

Specifically, in an OF-MOTP, an OpenSlice protocol converter is deployed, which is able to convert a PSR into an extended OpenFlow Packet In message (as detailed next) for further processing by the NOX. In addition, it can convert a Slice Mod message (as detailed next) into a vendor-specific command (e.g. Transaction Language 1) to control each Tx/Rx pair in a MOTP for a suitable central frequency (CF), slot width (SW) and modulation format.

In an OF-BV-WXC, an OpenSlice module with a cross-connection table (CT) is introduced. The CT maintains all the cross-connection information within an OF-BV-WXC, including input/output ports, CF, SW, and modulation format (as shown in Fig. 3
Fig. 3 A cross-connection table (CT) entry.
). Note that, the calculation of CF and SW presented in Fig. 3 is based on IETF work-in-progress drafts [18

18. Y. Li, F. Zhang, and R. Casellas, “Flexible grid label format in wavelength switched optical network,” IETF draft-li-ccamp-flexible-grid-label-00, work in progress (2011), http://tools.ietf.org/html/draft-li-ccamp-flexible-grid-label-00.

]. Conceptually, the CT is similar to the flow table in standard OpenFlow terminology. The Slice Mod message can add/delete a cross-connection entry into the CT, and thus control the OF-BV-WXC, allocating a cross-connection with the spectrum bandwidth to create an appropriately-sized optical path.

2.2 OpenFlow protocol extensions

The key extensions to OpenFlow protocol to support an EON are briefly summarized as follows: (a) The Feature Reply message is extended to report the new features of an EON (e.g., flexi-grid switching capability, available spectrum ranges, etc.) to the NOX controller; (b) The OpenFlow Packet In message is extended to carry the bit rate of each incoming sub-flow. (c) The NOX is extended to perform a routing and spectrum assignment (RSA) algorithm, allocating suitable frequency slots and the selected modulation format, according to the source/destination addresses and the bit rate of the flow, which are obtained from the extended Packet In messages. (d) A new message referred to as Slice Mod is introduced, which is based on the OpenFlow Flow Mod message. This new message carries the RSA results from the NOX, including actions (i.e., add a new cross-connection, delete a matching cross-connection, modify an existing cross-connect), input and output ports, central frequency, slot width, and modulation format.

2.3 Procedure for path provisioning in the EON

Firstly, a handshake procedure between the NOX and each OpenFlow-enabled network element (NE), e.g., an OF-BV-WXC, is required for the NOX to know the feature/capability of each NE, as the procedure shown in Fig. 4(a)
Fig. 4 (a) Handshake procedure between NOX and each OpenFlow-enabled NE; (b) Procedure for path provisioning in the optical domain. The Flow Mod messages between the NOX and IP routers are not depicted in this figure.
. Once a new NE is introduced to the network, Hello messages are changed between the NOX and the new NE. Then the NOX sends a Feature Request message to the NE, and the NE replies with Feature Reply message specifies the features and capabilities supported by this NE. Here, we extended the Feature Reply message for each OF-BV-WXC to report its new features/capabilities to the NOX, including its datapath ID, port number, supported switching type, available spectrum ranges for each port, etc. to the NOX controller. In addition, each NE also uses this extended Feature Reply message to report its peering connectivity, including the port ID and data path ID of its neighboring NEs. In order to guarantee the liveness of a connection between a NE and the NOX, Echo Request and Echo Reply messages are used, which can be sent from either the NE or the NOX. Figure 4(b) shows the procedure of path provisioning for one sub-flow from the ingress OF-MOTP. When the NOX receives a Packet In message from the ingress OF-MOTP, it performs the RSA computation according to the source and destination addresses and the bit rate information of this sub-flow, and then configures each OF-MOTP and OF-BV-WXC along the computed path, by using the aforementioned Slice Mod messages.

3. Experimental setup, results and discussions

Figure 6
Fig. 6 Wireshark capture of an extended Feature Reply message.
shows the Wireshark capture of an extended Feature Reply message during the handshake phase. It can be seen that, when a Feature Request message is received, the OF-BV-WXC automatically replied a Feature Reply message. The processing latency between Feature Request/Reply messages was around 1.3 ms, as shown Fig. 6. By using the Feature Reply message, each OF-BV-WXC reported its feature to the NOX controller, including its datapath ID, port number, supported switch type, neighbor information, available spectrum ranges for each port, etc. Note that the packet format for the extended Feature Reply message presented in Fig. 6 is based on the OpenFlow circuit switch addendum v0.3 [20

20. S. Das, “Extensions to the OpenFlow protocol in support of circuit switching,” (2010). http://www.openflow.org/wk/images/8/81/OpenFlow_Circuit_Switch_Specification_v0.3.pdf.

]. The only difference is that we newly defined bit map information to represent the flexible grid switching capability and resource availabilities. More details and the meaning of each field can be referred to [20

20. S. Das, “Extensions to the OpenFlow protocol in support of circuit switching,” (2010). http://www.openflow.org/wk/images/8/81/OpenFlow_Circuit_Switch_Specification_v0.3.pdf.

].

In the experiment, we set up six paths with different hop count, as shown in Table 1

Table 1. Experimental results

table-icon
View This Table
| View All Tables
. Figure 7
Fig. 7 Wireshark capture of the OpenSlice messages: (a) procedure for path (1) provisioning; (b) an extended Packet In message; (c) a Slice Mod message.
shows the Wireshark capture of OpenSlice messages for creating the path (1), including the message sequence (Fig. 7(a)), the extended Packet In message (Fig. 7(b)), and the Slice Mod message (Fig. 7(c)). It can be seen that the flow bit rate is encapsulated in the extended Packet In message, and the information for a new cross-connection entry is carried within the Slice Mod message. Table 1 also shows the OpenSlice message average latencies, obtained by repeating the experiment 100 times. In our tested scenario, the OpenSlice message latency for creating a path with 1~5 hops is around 32~36 ms. The path release procedure is also evaluated, by setting the Action type (Fig. 7(c)) in the Slice Mod message to “delete a matching cross-connection”. The results show that the latency for releasing a path with 1~5 hops is around 14~17 ms.

Finally, we verify the feasibility of the real hardware control by using the proposed OpenSlice control plane. Due to the hardware limitation, we set up a simple test scenario, as shown in Fig. 9(a)
Fig. 9 (a) Experimental setup for hardware control by using OpenSlice; (b)(c) filter profiles for the BV-WSS controlled by OpenSlice.
. In the data plane, we deployed a BV-WSS with real hardware, which was controlled by the NOX controller through the OpenSlice protocol. An amplified spontaneous emission (ASE) broadband light source and an optical spectrum analyzer were attached at this BV-WSS. In this experiment, the operator directly sent extended Packet In messages to the NOX controller, and according to the flow bit rate information in the Packet In messages, the NOX controller automatically controlled the BV-WSS to allocate a suitable spectrum bandwidth through Slice Mod messages. Figure 9(b) and Fig. 9(c) show the filter profiles of the BV-WSS by allocating 16 continuous slots and 4 continuous slots (12.5GHz per slot) for Packet In messages with different flow bit rate information. This test verified that the proposed OpenSlice control plane can be deployed in a real operational scenario to control real optical switching node. We observed that the latency for controlling a real BV-WSS was around 120 ms.

4. Conclusions

We successfully demonstrated OpenSlice, an OpenFlow-based control plane for spectrum sliced elastic optical path networks. We experimentally verified its overall feasibility for dynamic end-to-end path provisioning and IP traffic offloading through OpenFlow-based protocol extensions and seamless interworking operations. We also quantitatively evaluated its performance in terms of path provisioning latency, and compared it with the GMPLS-based control plane. The results indicate that, in our tested scenario, the OpenSlice outperforms the GMPLS-based control plane when creating a elastic optical path with more than 3 hops.

Our future works and open issues for OpenSlice include actual testbed demonstration with intelligent interworking between the OpenSlice and MOTPs, mitigation of the scalability issue for the OpenSlice architecture, OpenSlice-based control for multi-domain EON, as well as multi-vendor interoperability tests/field trials. So far, some preliminary studies have been carried out to address these issues [22

22. L. Liu, H. Choi, T. Tsuritani, I. Morita, R. Casellas, R. Martínez, and R. Muñoz, “First proof-of-concept demonstration of OpenFlow-controlled elastic optical networks employing flexible transmitter/receiver,” in in Proceedings of International Conference on Photonics in Switching (PS 2012), paper PDP-1 (Institute of Electrical and Electronics Engineers, New York, 2012). http://www.ps2012.net/postdeadline-papers.

24

24. M. Channegowda, R. Nejabati, M. Fard, S. Peng, N. Amaya, G. Zervas, D. Simeonidou, R. Vilalta, R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, A. Autenrieth, J. Elbers, P. Kostecki, and P. Kaczmarek, “First demonstration of an OpenFlow based software-defined optical network employing packet, fixed and flexible DWDM grid technologies on an international multi-domain testbed,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Th.3.D.2.

]. We hope the work presented in this paper will be beneficial for industrial deployment of EON with an intelligent unified control plane, and shed light on future researches in this area.

References and links

1.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag. 47(11), 66–73 (2009). [CrossRef]

2.

M. Jinno, B. Kozicki, H. Takara, A. Watanabe, Y. Sone, T. Tanaka, and A. Hirano, “Distance-adaptive spectrum resource allocation in spectrum-sliced elastic optical path network,” IEEE Commun. Mag. 48(8), 138–145 (2010). [CrossRef]

3.

R. Muñoz, R. Casellas, and R. Martínez, “Dynamic distributed spectrum allocation in GMPLS-controlled elastic optical networks,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.4.

4.

N. Sambo, F. Cugini, G. Bottari, P. Iovanna, and P. Castoldi, “Distributed setup in optical networks with flexible grid,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper We.10.P1.100.

5.

R. Casellas, R. Muñoz, J. M. Fàbrega, M. S. Moreolo, R. Martínez, L. Liu, T. Tsuritani, and I. Morita, “Experimental assessment of a combined PCE-RMA and distributed spectrum allocation mechanism for GMPLS elastic CO-OFDM optical networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper OM3G.1.

6.

R. Martínez, R. Casellas, and R. Muñoz, “Experimental validation / evaluation of a GMPLS unified control plane in multi-layer (MPLS-TP/WSON) networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper NTu2J.1.

7.

A. Farrel, “A unified control plane: dream or pipedream,” presented at the 6th International Conference on IP + Optical Network (IPOP 2010), Tokyo, Japan, 10–11 Jun., 2010. http://www.pilab.jp/ipop2010/info/onlineproceedings.html.

8.

S. Das, G. Parulka, and N. Mckeown, “Why OpenFlow/SDN can succeed where GMPLS failed,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Tu.1.D.1.

9.

L. Liu, T. Tsuritani, I. Morita, H. Guo, and J. Wu, “OpenFlow-based wavelength path control in transparent optical networks: a proof-of-concept demonstration,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.2.

10.

“The OpenFlow switch consortium,” http://www.openflow.org/.

11.

S. Das, G. Parulkar, N. McKeown, P. Singh, D. Getachew, and L. Ong, “Packet and circuit network convergence with OpenFlow,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2010), Technical Digest (CD) (Optical Society of America, 2010), paper OTuG1.

12.

L. Liu, T. Tsuritani, I. Morita, H. Guo, and J. Wu, “Experimental validation and performance evaluation of OpenFlow-based wavelength path control in transparent optical networks,” Opt. Express 19(27), 26578–26593 (2011). [CrossRef] [PubMed]

13.

L. Liu, D. Zhang, T. Tsuritani, R. Vilalta, R. Casellas, L. Hong, I. Morita, H. Guo, J. Wu, R. Martínez, and R. Muñoz, “First field trial of an OpenFlow-based unified control plane for multi-layer multi-granularity optical networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper PDP5D.2.

14.

L. Liu, R. Muñoz, R. Casellas, T. Tsuritani, R. Martínez, and I. Morita, “OpenSlice: an OpenFlow-based control plane for spectrum sliced elastic optical path networks,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Mo.2.D.3.

15.

M. Jinno, Y. Sone, H. Takara, A. Hirano, K. Yonenaga, and S. Kawai, “IP traffic offloading to elastic optical layer using multi-flow optical transponder,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Mo.2.K.2.

16.

H. Takara, T. Goh, K. Shibahara, K. Yonenaga, S. Kawai, and M. Jinno, “Experimental demonstration of 400 Gb/s multi-flow, multi-rate, multi-reach optical transmitter for efficient elastic spectral routing,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.A.4.

17.

“NOX: an OpenFlow controller,” http://noxrepo.org/.

18.

Y. Li, F. Zhang, and R. Casellas, “Flexible grid label format in wavelength switched optical network,” IETF draft-li-ccamp-flexible-grid-label-00, work in progress (2011), http://tools.ietf.org/html/draft-li-ccamp-flexible-grid-label-00.

19.

O. Gerstel, M. Jinno, A. Lord, and S. J. Yoo, “Elastic optical networking: a new dawn for the optical layer?” IEEE Commun. Mag. 50(2), s12–s20 (2012). [CrossRef]

20.

S. Das, “Extensions to the OpenFlow protocol in support of circuit switching,” (2010). http://www.openflow.org/wk/images/8/81/OpenFlow_Circuit_Switch_Specification_v0.3.pdf.

21.

R. Muñoz, R. Martinez, and R. Casellas, “Challenges for GMPLS lightpath provisioning in transparent optical networks: wavelength constraints in routing and signalling,” IEEE Commun. Mag. 47(8), 26–34 (2009). [CrossRef]

22.

L. Liu, H. Choi, T. Tsuritani, I. Morita, R. Casellas, R. Martínez, and R. Muñoz, “First proof-of-concept demonstration of OpenFlow-controlled elastic optical networks employing flexible transmitter/receiver,” in in Proceedings of International Conference on Photonics in Switching (PS 2012), paper PDP-1 (Institute of Electrical and Electronics Engineers, New York, 2012). http://www.ps2012.net/postdeadline-papers.

23.

L. Liu, R. Casellas, T. Tsuritani, I. Morita, R. Martínez, and R. Muñoz, “Experimental demonstration of an OpenFlow/PCE integrated control plane for IP over translucent WSON with the assistance of a per-request-based dynamic topology server,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Tu.1.D.3.

24.

M. Channegowda, R. Nejabati, M. Fard, S. Peng, N. Amaya, G. Zervas, D. Simeonidou, R. Vilalta, R. Casellas, R. Martínez, R. Muñoz, L. Liu, T. Tsuritani, I. Morita, A. Autenrieth, J. Elbers, P. Kostecki, and P. Kaczmarek, “First demonstration of an OpenFlow based software-defined optical network employing packet, fixed and flexible DWDM grid technologies on an international multi-domain testbed,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Th.3.D.2.

OCIS Codes
(060.4250) Fiber optics and optical communications : Networks
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Backbone and Core Networks

History
Original Manuscript: October 1, 2012
Revised Manuscript: December 14, 2012
Manuscript Accepted: December 17, 2012
Published: February 12, 2013

Virtual Issues
European Conference on Optical Communication 2012 (2012) Optics Express

Citation
Lei Liu, Raül Muñoz, Ramon Casellas, Takehiro Tsuritani, Ricardo Martínez, and Itsuro Morita, "OpenSlice: an OpenFlow-based control plane for spectrum sliced elastic optical path networks," Opt. Express 21, 4194-4204 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-4-4194


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References

  1. M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag.47(11), 66–73 (2009). [CrossRef]
  2. M. Jinno, B. Kozicki, H. Takara, A. Watanabe, Y. Sone, T. Tanaka, and A. Hirano, “Distance-adaptive spectrum resource allocation in spectrum-sliced elastic optical path network,” IEEE Commun. Mag.48(8), 138–145 (2010). [CrossRef]
  3. R. Muñoz, R. Casellas, and R. Martínez, “Dynamic distributed spectrum allocation in GMPLS-controlled elastic optical networks,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.4.
  4. N. Sambo, F. Cugini, G. Bottari, P. Iovanna, and P. Castoldi, “Distributed setup in optical networks with flexible grid,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper We.10.P1.100.
  5. R. Casellas, R. Muñoz, J. M. Fàbrega, M. S. Moreolo, R. Martínez, L. Liu, T. Tsuritani, and I. Morita, “Experimental assessment of a combined PCE-RMA and distributed spectrum allocation mechanism for GMPLS elastic CO-OFDM optical networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper OM3G.1.
  6. R. Martínez, R. Casellas, and R. Muñoz, “Experimental validation / evaluation of a GMPLS unified control plane in multi-layer (MPLS-TP/WSON) networks,” in Optical Fiber Communication Conference and Exposition and National Fiber Optic Engineers Conference (OFC/NFOEC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper NTu2J.1.
  7. A. Farrel, “A unified control plane: dream or pipedream,” presented at the 6th International Conference on IP + Optical Network (IPOP 2010), Tokyo, Japan, 10–11 Jun., 2010. http://www.pilab.jp/ipop2010/info/onlineproceedings.html .
  8. S. Das, G. Parulka, and N. Mckeown, “Why OpenFlow/SDN can succeed where GMPLS failed,” in 38th European Conference and Exhibition on Optical Communications (ECOC 2012), Technical Digest (CD) (Optical Society of America, 2012), paper Tu.1.D.1.
  9. L. Liu, T. Tsuritani, I. Morita, H. Guo, and J. Wu, “OpenFlow-based wavelength path control in transparent optical networks: a proof-of-concept demonstration,” in 37th European Conference and Exhibition on Optical Communications (ECOC 2011), Technical Digest (CD) (Optical Society of America, 2011), paper Tu.5.K.2.
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