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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 26 — Dec. 12, 2011
  • pp: B242–B250
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Development of optical packet and circuit integrated ring network testbed

Hideaki Furukawa, Hiroaki Harai, Takaya Miyazawa, Satoshi Shinada, Wataru Kawasaki, and Naoya Wada  »View Author Affiliations


Optics Express, Vol. 19, Issue 26, pp. B242-B250 (2011)
http://dx.doi.org/10.1364/OE.19.00B242


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Abstract

We developed novel integrated optical packet and circuit switch-node equipment. Compared with our previous equipment, a polarization-independent 4 × 4 semiconductor optical amplifier switch subsystem, gain-controlled optical amplifiers, and one 100 Gbps optical packet transponder and seven 10 Gbps optical path transponders with 10 Gigabit Ethernet (10GbE) client-interfaces were newly installed in the present system. The switch and amplifiers can provide more stable operation without equipment adjustments for the frequent polarization-rotations and dynamic packet-rate changes of optical packets. We constructed an optical packet and circuit integrated ring network testbed consisting of two switch nodes for accelerating network development, and we demonstrated 66 km fiber transmission and switching operation of multiplexed 14-wavelength 10 Gbps optical paths and 100 Gbps optical packets encapsulating 10GbE frames. Error-free (frame error rate < 1×10−4) operation was achieved with optical packets of various packet lengths and packet rates, and stable operation of the network testbed was confirmed. In addition, 4K uncompressed video streaming over OPS links was successfully demonstrated.

© 2011 OSA

1. Introduction

2. Integrated optical packet and circuit switch-node and key technologies

Figures 1(a)
Fig. 1 (a) Photograph and (b) configuration of integrated optical packet and circuit switch node.
and 1(b) show a photograph and a schematic illustration of our novel integrated OPS/OCS node, which mainly consists of six kinds of devices: seven 10G-OTN transponders, a 100G-OP transponder, two wavelength-selective switches (WSS), a 4 × 4 SOA switch subsystem, a switch controller, and some optical amplifiers. In OCS links, to send data on optical paths, a 10G-OTN transponder encapsulates 10GbE frames from the client side into OTN format. Because optical paths are established by control packets in advance, there is no need to read the IP destination address of incoming 10GbE frames. On the other hand, in OPS links, a 100G-OP transponder encapsulates incoming 10GbE frames from the client side into 100 Gbps optical packets, as shown in Fig. 2
Fig. 2 100 Gbps colored optical packet and 10G Ethernet frame conversion.
. Although a number of 10GbE interfaces should be provided at each OP transponder to realize full bandwidth utilization of OPS links, in this paper, each OP transponder has one 100 Gbps optical packet interface and one 10GbE interface due to the limited number of components. We introduce 100 Gbps colored optical packets with ten 10 Gbps optical payloads, as shown at the bottom of Fig. 2. A 16-byte preamble signal is attached to each optical payload. The total size of the 10GbE frame is from 64 to 9604 bytes. The packet length of an optical packet is variable, corresponding to the length of the 10GbE frame. In parallel, a 10 Gbps, 8-byte route header including an 8-bit destination Node-ID is attached in one payload of an optical packet. The destination Node-ID is determined according to a mapping table between destination Node-IDs and the IP destination addresses of incoming 10GbE frames. Bit pattern matching of IP addresses within an arbitrary range is possible by masking and offset functions.

Wavelength resources are divided by waveband, and each of these wavebands is allocated to OPS or OCS links. In the integrated OPS/OCS node, two WSSs are used for combining or dividing OPS and OCS wavebands. In principle, the WSS can flexibly move the boundary of wavelength resources between OPS and OCS links. In addition, two WSSs also work as add/drop multiplexers for OCS links. In setting or releasing optical paths by control packets, the WSSs forward an optical signal on an optical path to the correct output port. For OPS links, a switch controller reads the destination Node-ID of a route header and controls a 4 × 4 SOA switch subsystem to forward an optical packet to the correct output port according to a switching table in each input port. A 4 × 4 SOA switch subsystem with a broadcast-and-select configuration has been developed [10

10. K. Sone, S. Yoshida, Y. Kai, G. Nakagawa, G. Ishikawa, and S. Kinoshita, “High-Speed 4×4 SOA Switch Subsystem for DWDM Systems,” in Proc. 16th OptoElectronics and Communications Conference (2011), no.8A2_2.

,11

11. G. Nakagawa, Y. Kai, K. Sone, S. Yoshida, S. Tanaka, K. Morito, and S. Kinoshita, “Ultra-High Extinction Ratio and Low Cross Talk Characteristics of 4-Array Integrated SOA Module with Compact-Packaging Technologies,” in Proc. 37th European Conference and Exhibition on Optical Communication (2011), no. Mo.2.LeSaleve.4.

]. The SOA has a switching speed of several nanoseconds, low polarization-dependency, and loss compensation. Previously, the switch subsystem had a minimum channel-space limitation of 400 GHz to avoid the crosstalk caused by a four-wave mixing effect. This time, the switch subsystem separates 100 GHz-spacing colored optical packets into four wavelength groups by using 100/400 GHz interleavers to switch each wavelength group. Therefore, the switch subsystem can handle 100 GHz-spacing colored optical packets without crosstalk.

To show the low polarization-dependency, we measured the spectrum of ten optical payloads of a forwarded 100 Gbps optical packet at the output of the integrated OPS/OCS node. Figure 3
Fig. 3 Measured spectrum of optical packets after one integrated OPS/OCS node polarization rotation of packets.
shows the maximum and minimum peak-intensity when the polarization of the optical packet was randomly rotated by a polarization controller at the input of the integrated OPS/OCS node. The intensity difference of about 2 dB is due to the polarization-dependency of the integrated OPS/OCS node including one 4 × 4 SOA switch subsystem. To eliminate optical surges and gain transients for shorter packets (~100 ns), we developed a transient-suppressed erbium-doped fiber amplifier (TS-EDFA) [12

12. Y. Awaji, H. Furukawa, N. Wada, P. Chan, and R. Man, “Mitigation of Transient Response of Erbium-Doped Fiber Amplifier for Traffic of High Speed Optical Packets,” in Proc. Conf. on Lasers and Electro-Optics (2007), no. JTuA133.

]. In addition, we improved the TS-EDFAs by optimizing the fiber length, the core diameter, and the erbium density of the EDF and adjusting the power of a pump laser-diode to suppress the wavelength-dependent gain and the output power fluctuation due to the changing packet-rate.

3. Ring network testbed and demonstration

Each node can send a data on an optical path and an optical packet not only to an opposite node but also to itself via the ring network for an external loopback test. We transmitted both data on optical paths and optical packets through various routes of the ring network. For example, we tested an OPS loop route from NW tester 1 to NW tester 2 through Node 1 and Node 2. At NW tester 1, the frame length, the frame interval, and the bit-rate of 10GbE frames were set to 1518 bytes, 232 bytes, and 8.6 Gbps, respectively. A 10GbE frame from NW tester 1 with the IP destination address 10.100.1.12 of NW tester 2 was encapsulated into a 100 Gbps colored optical packet by a 100G-OP transponder at Node 1. The destination Node-ID of “10” was given to the optical packet according to a mapping table with a 24-bit mask (/24), as shown at the bottom of Fig. 4. A switch controller outputted a control signal to the SOA switch subsystem and forwarded the optical packet to the output port 1 according to the switching table in the input port 4. A WSS for adding outputted the optical packet to the network side. The optical packet was transmitted through a 50 km fiber. At the same time, data on each 7-channel optical path from Nodes 1 and 2 was transmitted around ring networks and multiplexed with optical packets. In Node 2, the optical packet with the destination Node-ID of “10” was sent to an SOA switch subsystem by a WSS for dropping and was forwarded from the input port 1 to the output port 1 at the switch subsystem. Again, the optical packet was transmitted through another 50 km fiber. Only optical packets with the destination Node-ID of “20” were forwarded to the output port 4 and dropped into a 100G-OP transponder at Node 2. Finally, after going around, the optical packet with the destination Node-ID of “10” was dropped at the output port 4 of the SOA switch subsystem in Node 1. The 10GbE frame was recovered from the optical packet and sent to NW tester 2. Figures 5(a)
Fig. 5 (a)–(d) Eye diagrams of one optical payload of 100 Gbps optical packets in a go-around transmission from Node 1, measured at points (a)–(d) shown in Fig. 4. (e) Spectrum and (f) temporal waveform of multiplexed optical packets and optical paths measured at output of Node 1. (g) Temporal waveform of only optical packet extracted by a band-pass filter.
5(d) show the eye-diagrams of an optical payload of 1549.8 nm measured at the output of each EDFA in the loop route from Node 1. The measured points are (a)–(d) in Fig. 4. The Q-factors in Figs. 5(a)5(d) were 10.4, 9.90, 8.73, and 8.51, respectively. Figure 5(e) shows the spectrum of the multiplexed optical packets and optical paths at the output of Node 1. Figure 5(f) shows the temporal waveform of the multiplexed optical packets and optical paths, in which the optical packet rate was 10%, and Fig. 5(g) is the temporal waveform of only an optical packet extracted by a band-pass filter.

4. Conclusion

We built a novel optical packet and circuit integrated ring network testbed with two OPS/OCS nodes and verified the performance. We demonstrated 66 km transmission and switching of 100 Gbps colored optical packets and 14-wavelength 10 Gbps optical paths. We achieved error-free operation and confirmed basic functions on the network testbed. The testbed can contribute to accelerating network development.

Acknowledgments

The authors would like to thank Takeshi Makino, Wei Ping Ren, and Tomoji Tomuro of the National Institute of Information and Communications Technology for their support in the experiments.

References and links

1.

Ministry of Economy, Trade, and Industry, Japan, “Green IT Initiative in Japan” (October 2008).

2.

“AKARI Architecture Conceptual Design Ver1.0 (2007)”, http://akari-project.nict.go.jp/eng/index2.htm.

3.

H. Harai, “Optical packet & path integration for energy savings toward new generation network,” in Proc. 1st Workshop on Power Consumptions in Future Network Systems in SAINT (2008).

4.

H. Furukawa, T. Miyazawa, K. Fujikawa, N. Wada, and H. Harai, “Control-message exchange of lightpath setup over colored optical packet switching in an optical packet and circuit integrated network,” IEICE Electron. Express 7(14), 1079–1085 (2010). [CrossRef]

5.

H. Furukawa, T. Miyazawa, K. Fujikawa, N. Wada, and H. Harai, “First Development of Integrated Optical Packet and Circuit Switching Node for New-Generation Networks,” in Proc. 36th European Conference and Exhibition on Optical Communication (2010), no. We.8.A.4.

6.

T. Miyazawa, H. Furukawa, K. Fujikawa, N. Wada, and H. Harai, “Experimental Performance Evaluation of Control Mechanisms for Integrated Optical Packet- and Circuit-Switched Networks,” IEEE GLOBECOM 2010 Workshop on Network of the Future (FutureNet-III, 2010), no. FutNet05.1, pp. 345–350.

7.

H. Furukawa, H. Harai, T. Miyazawa, S. Shinada, W. Kawasaki, and N. Wada, “First Demonstration of Optical Packet and Circuit Integrated Ring Network Testbed,” in Proc. 37th European Conference and Exhibition on Optical Communication (2011), no. We.9.K.3.

8.

N. Kataoka, K. Sone, N. Wada, Y. Aoki, S. Kinoshita, H. Miyata, T. Miyazaki, H. Onaka, and K.-I. Kitayama, “Field Trial of 640-Gbit/s-Throughput, Granularity-Flexible Optical Network using Packet-Selective ROADM Prototype,” J. Lightwave Technol. 27(7), 825–832 (2009). [CrossRef]

9.

D. Chiaroni, “Optical Packet Add/Drop Multiplexers for packet ring networks,” in Proc. 34th European Conference and Exhibition on Optical Communication (2008), no. Th.2.E.1.

10.

K. Sone, S. Yoshida, Y. Kai, G. Nakagawa, G. Ishikawa, and S. Kinoshita, “High-Speed 4×4 SOA Switch Subsystem for DWDM Systems,” in Proc. 16th OptoElectronics and Communications Conference (2011), no.8A2_2.

11.

G. Nakagawa, Y. Kai, K. Sone, S. Yoshida, S. Tanaka, K. Morito, and S. Kinoshita, “Ultra-High Extinction Ratio and Low Cross Talk Characteristics of 4-Array Integrated SOA Module with Compact-Packaging Technologies,” in Proc. 37th European Conference and Exhibition on Optical Communication (2011), no. Mo.2.LeSaleve.4.

12.

Y. Awaji, H. Furukawa, N. Wada, P. Chan, and R. Man, “Mitigation of Transient Response of Erbium-Doped Fiber Amplifier for Traffic of High Speed Optical Packets,” in Proc. Conf. on Lasers and Electro-Optics (2007), no. JTuA133.

13.

H. Harai and N. Wada, “More than 10 Gbps photonic packet-switched networks using WDM-based packet compression,” in Proc. 8th OptoElectronics and Communications Conference, pp. 703–704. (2003).

14.

ITU-T Recommendation Y.1541.

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: September 30, 2011
Manuscript Accepted: November 1, 2011
Published: November 18, 2011

Virtual Issues
European Conference on Optical Communication 2011 (2011) Optics Express

Citation
Hideaki Furukawa, Hiroaki Harai, Takaya Miyazawa, Satoshi Shinada, Wataru Kawasaki, and Naoya Wada, "Development of optical packet and circuit integrated ring network testbed," Opt. Express 19, B242-B250 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-26-B242


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References

  1. Ministry of Economy, Trade, and Industry, Japan, “Green IT Initiative in Japan” (October 2008).
  2. “AKARI Architecture Conceptual Design Ver1.0 (2007)”, http://akari-project.nict.go.jp/eng/index2.htm .
  3. H. Harai, “Optical packet & path integration for energy savings toward new generation network,” in Proc. 1st Workshop on Power Consumptions in Future Network Systems in SAINT (2008).
  4. H. Furukawa, T. Miyazawa, K. Fujikawa, N. Wada, and H. Harai, “Control-message exchange of lightpath setup over colored optical packet switching in an optical packet and circuit integrated network,” IEICE Electron. Express7(14), 1079–1085 (2010). [CrossRef]
  5. H. Furukawa, T. Miyazawa, K. Fujikawa, N. Wada, and H. Harai, “First Development of Integrated Optical Packet and Circuit Switching Node for New-Generation Networks,” in Proc. 36th European Conference and Exhibition on Optical Communication (2010), no. We.8.A.4.
  6. T. Miyazawa, H. Furukawa, K. Fujikawa, N. Wada, and H. Harai, “Experimental Performance Evaluation of Control Mechanisms for Integrated Optical Packet- and Circuit-Switched Networks,” IEEE GLOBECOM 2010 Workshop on Network of the Future (FutureNet-III, 2010), no. FutNet05.1, pp. 345–350.
  7. H. Furukawa, H. Harai, T. Miyazawa, S. Shinada, W. Kawasaki, and N. Wada, “First Demonstration of Optical Packet and Circuit Integrated Ring Network Testbed,” in Proc. 37th European Conference and Exhibition on Optical Communication (2011), no. We.9.K.3.
  8. N. Kataoka, K. Sone, N. Wada, Y. Aoki, S. Kinoshita, H. Miyata, T. Miyazaki, H. Onaka, and K.-I. Kitayama, “Field Trial of 640-Gbit/s-Throughput, Granularity-Flexible Optical Network using Packet-Selective ROADM Prototype,” J. Lightwave Technol.27(7), 825–832 (2009). [CrossRef]
  9. D. Chiaroni, “Optical Packet Add/Drop Multiplexers for packet ring networks,” in Proc. 34th European Conference and Exhibition on Optical Communication (2008), no. Th.2.E.1.
  10. K. Sone, S. Yoshida, Y. Kai, G. Nakagawa, G. Ishikawa, and S. Kinoshita, “High-Speed 4×4 SOA Switch Subsystem for DWDM Systems,” in Proc. 16th OptoElectronics and Communications Conference (2011), no.8A2_2.
  11. G. Nakagawa, Y. Kai, K. Sone, S. Yoshida, S. Tanaka, K. Morito, and S. Kinoshita, “Ultra-High Extinction Ratio and Low Cross Talk Characteristics of 4-Array Integrated SOA Module with Compact-Packaging Technologies,” in Proc. 37th European Conference and Exhibition on Optical Communication (2011), no. Mo.2.LeSaleve.4.
  12. Y. Awaji, H. Furukawa, N. Wada, P. Chan, and R. Man, “Mitigation of Transient Response of Erbium-Doped Fiber Amplifier for Traffic of High Speed Optical Packets,” in Proc. Conf. on Lasers and Electro-Optics (2007), no. JTuA133.
  13. H. Harai and N. Wada, “More than 10 Gbps photonic packet-switched networks using WDM-based packet compression,” in Proc. 8th OptoElectronics and Communications Conference, pp. 703–704. (2003).
  14. ITU-T Recommendation Y.1541.

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