Adaptive Data Rates for Flexible Transceivers in Optical Networks

Teipen, Brian T.; Eiselt, Michael; Grobe, Klaus; Elbers, Jörg-Peter

doi:10.4304/jnw.7.5.776-782

Cited by 38 publications

(17 citation statements)

References 6 publications

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“…Fig. 3(b), two DACs, each having four-level pulse amplitude modulation (4-PAM) output format, generate the electrical signals for I and Q modulators [5,14]. Figure 3(c) shows another method to build a 16-QAM constellation by combining two QPSK modulators [5].…”

Section: System Level Considerationsmentioning

confidence: 98%

Power-Efficiency Considerations for Adaptive Long-Haul Optical Transceivers

Sedighi¹,

Khodakarami

Pillai

et al. 2014

J. Opt. Commun. Netw.

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Adaptive optical transceivers are considered among the candidates for future optical communications, especially in long-haul and metro applications. In this paper, the hardware requirements of the adaptive digital coherent transceivers are studied. Challenges and solutions for power-efficient implementation of the electrooptical front-end and digital signal processor are investigated. Different power-saving modes are also presented.

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Section: System Level Considerationsmentioning

confidence: 98%

Power-Efficiency Considerations for Adaptive Long-Haul Optical Transceivers

Sedighi¹,

Khodakarami

Pillai

et al. 2014

J. Opt. Commun. Netw.

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“…1, 1 =2 bit/symbol for QPSK and 2 =4 bit/symbol for 16QAM. Thus, the SE of a QPSK&16QAM ( 1 , 2 ) signal can range from 2 to 4 bit/symbol, and the line rate (LR) of an optical channel modulated by this signal is = * 2 bit/s (2) where is the baud rate of the signal in units of symbol/s, and because the optical transmission system is assumed to employ polarization division multiplexing (PDM), number "2" corresponds to the x-polarization and the y-polarization of PDM. Assuming the baud rate of an optical channel is fixed, the line rate of the channel is only determined by SE, which is further dependent on the { } distribution of modulation formats in a frame.…”

Section: Time Domain Hybrid Modulation Techniquementioning

confidence: 99%

“…To increase the data rate and spectral efficiency of an optical network, high-order modulation formats such as Quadrature Amplitude Modulation (QAM) have been employed, which however requires a higher optical signal to noise ratio (OSNR) tolerance, and therefore inevitably limits the transparent reach of a lightpath [1]. Much effort has been made to design flexible transceivers that can provide flexible bandwidth and achieve the best spectral efficiency based on the current network traffic demands and fiber-link conditions [2][3][4]. The state-of-the-art optical transceiver can dynamically change its bit rate, modulation format, FEC type, etc.…”

Section: Introductionmentioning

confidence: 99%

Explore Maximal Potential Capacity of WDM Optical Networks Using Time Domain Hybrid Modulation Technique

Dai

Shen

2015

J. Lightwave Technol.

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Abstract-The recent emerging time domain hybrid modulation (TDHM) technique is considered promising because it can realize continuous adaptation between spectral efficiency and transparent reach through appropriately allocating the time slot occupancy ratios of different modulation formats in a time-division multiplexing (TDM) frame. This technique is expected to achieve more efficient spectrum utilization or higher transmission capacity than the traditional transmission technique based on discrete modulation formats. For the point-to-point transmission system, the benefit of the TDHM technique has been experimentally verified. However, its benefit from the whole network perspective has not been explored yet. In this paper, we apply the TDHM technique to the optical network to maximize its transmission capacity. To evaluate the benefit of this technique, we consider the routing and wavelength assignment (RWA) problem for the TDHM-based WDM network, for which we develop an Integer Linear Programming (ILP) model and a waveplane-based heuristic algorithm to maximize the total network transmission capacity for the cases with and without network protection. For the protection case, the shared backup path protection (SBPP) technique is employed owing to its efficiency of spare capacity sharing and simplicity in network operation. The simulation study shows that compared to the design with discrete modulation formats, the TDHM-based approach can significantly increase the network transmission capacity. Index Terms-Time domain hybrid modulation (TDHM), rate adaptive optical network, waveplane-based heuristic algorithm, network capacityPart of the work was presented in ACP 2014 [32] and OFC 2015 [33].

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“…Newer capabilities in optical transponders allow several parameters to be made programmable, and trade-offs can then be made among an optical data channel's bit-rate, optical bandwidth occupancy, and transparent distance-reach [1][2]. Figure 1 (a) illustrates a transponder architecture that supports creating various multi-level modulation formats.…”

Section: Introductionmentioning

confidence: 99%