25km SSMF IMDD系统上创纪录19.25Gb/s双频OOFDM无色传输实验

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该研究论文报道了一项创新性的实验成果，实现了在25公里标准单模光纤(SSMF)基础设施上，通过反射电吸收调制器(REAM)驱动的19.25 Gb/s实时端到端双频光正交频分复用(Optical OFDM，简称OOFDM)无色传输的突破。这是一项前所未有的技术展示，尤其是在如此长距离和高速度下。核心内容包括： 1. 技术突破：研究人员首次证明了能够在C频段（1.3 - 1.7 GHz）内实现19.25 Gb/s的实时传输，这是目前在光学通信领域的一个重大里程碑。使用的是强度调制和直接检测技术，通过集成FPGA的数字信号处理(DSP)单元，将基带（0-2 GHz）和通带（6.125 ± 2 GHz）的OFDM射频子带分别独立产生和检测，每个子带分别支持9.75 Gb/s和9.5 Gb/s的数据传输速率。 2. 高效硬件配置：系统配置精简，采用100 MHz的时钟频率，以及低至4 GS/s的模拟到数字转换器(DAC)和数字到模拟转换器(ADC)采样速度，提高了系统的能源效率和灵活性。 3. 实验优化：通过在线自适应收发器优化功能和实时性能监控，研究人员精细调整了OOFDM发射器和系统的各项参数，以最大化每个子带的信号传输性能，并确保了基带和通带信号的误码率相近。 4. 功率和灵敏度：实验结果显示，即使在不同的C波段波长下，接收光功率在FEC限制范围内变化小于0.5 dB，表明系统的稳健性。此外，系统对RF子带功率变化具有大约3 dB的容限，这意味着在一定程度上的功率调整不会显著影响传输性能。这项研究不仅展示了高性能的光纤通信系统设计能力，也为未来在更远距离、更高数据速率的无线和有线通信系统中采用类似技术提供了重要的参考。其潜在的应用领域包括数据中心互联、无线接入网(WiGig)和下一代移动通信系统。

flexibility and wavelength scalability, virtual point-to-point connection enabling each

individual end-user to be granted a single wavelength, protocol transparency and excellent

network security [1,2]. To practically deploy WDM-PONs, the main challenges are cost-

effectiveness and colorlessness of optical network units (ONUs). To address such challenges,

several techniques have been proposed, which include, for example, spectrum-slicing of super

luminescent diodes (SLDs) or optical amplifiers [3,4], wavelength tunable lasers in ONUs

[5,6] and remote modulation of reflective intensity modulators [7,8].

Among all the aforementioned techniques proposed previously, reflective intensity

modulator-based ONUs are very attractive for WDM-PONs since the implementation of

centrally-controlled dynamic wavelength management in an optical line terminal (OLT)

allows the reflected upstream signal transmission from the ONU in a wavelength agnostic

manner. More importantly, since ONU-side laser sources are not present, the ONU

transceiver complexity is greatly simplified and consequently the overall WDM-PON

installation cost is significantly reduced by a factor proportional to the total number ONUs

accommodated simultaneously in the network. To achieve reflective intensity modulation-

based cost-effective ONUs, reflective intensity modulators that can be utilized include, for

example, reflective semiconductor optical amplifiers (RSOAs) [9–11], reflective electro-

absorption modulators (REAMs) [12–14] and reflective Fabry-Perot lasers [15–17]. Among

these reflective intensity modulator candidates, REAMs can be easily scaled for data line

rates higher than 10Gbits/s compared to other reflective modulators due to their high

modulation bandwidths. For example, 40Gb/s transmission over 20km standard single mode

fiber (SSMF) with offline digital signal processing (DSP) has been achieved by using a

20GHz SOA-REAM.

To further enhance the performance and flexibility of WDM-PONs and still maintain their

compatibility with existing time-division-multiplexed (TDM) PONs, optical orthogonal

frequency division multiplexing (OOFDM) has been considered as one of the strongest

contenders for practical applications [18], since OOFDM has inherent and unique advantages

including adaptive provision of hybrid dynamic bandwidth allocation (DBA) in both the

frequency and time domains, significant reduction in network complexity, adaptability to

imperfect transmission system characteristics and potential for cost-effective mass

deployment. It is, therefore, preferable if use is made of OOFDM signals in REAM-based

ONUs in WDM-PONs incorporating SSMF systems utilizing simple intensity modulation and

direct detection (IMDD).

To exploit the feasibility of WDM-PONs incorporating colorless REAM-based ONUs, we

have experimentally achieved 10Gb/s real-time end-to-end transmissions of single-band

OOFDM (SB-OOFDM) signals over 25km SSMF [19]. However, to further improve the

transmission capacity of a colorless REAM-based SB-OOFDM ONU in a cost-effective

approach, system designers face great challenges, as higher speed digital-to-analogue

converters (DACs) and analogue-to-digital converters (ADCs) are required, this makes it

difficult to avoid a prohibitive ONU transceiver cost. Another important issue to consider

when employing ultra-high sampling speed DACs/ADCs in the SB-OOFDM transceivers is

the escalation of the data bus capacity between the converters and the DSP logic circuits.

These ultra-high capacity data buses can be challenging to implement when trying to meet

tight cost and power constraints.

By employing a multi-band OOFDM (MB-OOFDM) approach, where multiple OFDM

signals are frequency division multiplexed (FDM) in the electrical domain, virtually all the

aforementioned disadvantages associated with the SB-OOFDM approach are eliminated.

Firstly, the bandwidth requirements of key components such as DACs/ADCs are dictated

only by the sub-band bandwidth and are no longer dependent on the total system capacity.

The increased flexibility in component choice can be highly beneficial for greatly lowering

the ONU transceiver cost. Secondly, by careful selection of the sub-band transmission

capacity, the ONU performance can be designed to meet the required peak user transmission

capacity whilst maintaining sufficient intra-band DBA functionality. In addition, MB-

OOFDM also has the salient advantage of significantly reducing transceiver complexity in

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Received 22 Jan 2013; revised 28 Mar 2013; accepted 2 Apr 2013; published 5 Apr 2013

8 April 2013 | Vol. 21, No. 7 | DOI:10.1364/OE.21.009167 | OPTICS EXPRESS 9169

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25km SSMF IMDD系统上创纪录19.25Gb/s双频OOFDM无色传输实验

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