无线光纤系统中10 Gb/s 16-QAM信号的直接调制激光电光转换新方案

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"10 Gb/s 16-quadrature amplitude modulation (16-QAM) 信号通过直接调制激光器在无线光纤系统中的传输，用于实现电气/光学转换" 这篇论文提出并实验验证了一种新颖的方法，用于在W波段的无线光纤集成系统的接收端实现电气/光学（E/O）转换。研究中，使用直接调制激光器（DML）进行这种转换。在接收端，85 GHz 的无线毫米波（mm-wave）信号首先被下变频成10 GHz的中频（IF）电信号，以解决后续DML带宽不足的问题。这一过程的关键在于，通过下变频可以有效扩展信号处理能力，适应高速数据传输的需求。随后，两个级联的电子放大器（EAs）被用来增强这个中频电信号的强度，以便驱动DML。这样的设计提高了信号的功率，确保了在驱动DML时信号的质量，从而保证了高数据速率的稳定传输。具体来说，研究人员成功地利用该方案传输了一个10 Gb/s的16正交幅度调制（16-QAM）信号，经过10米的无线链路，并实现了有效的接收。16-QAM是一种高级调制技术，能够在单个信道上传输更多的数据，因此对于高容量的通信系统至关重要。此外，这项工作还强调了解决直接调制激光器带宽限制的方法，这是无线光纤通信系统中的一个常见挑战。通过将毫米波信号转换为IF信号，然后利用DML进行光电转换，研究团队成功地克服了这一难题，展示了在无线环境中实现高速、高容量数据传输的可能性。这篇论文贡献了一种创新的解决方案，它不仅有助于提升无线光纤系统的性能，还可能对未来的5G和6G通信网络的设计产生深远影响，尤其是在高频率毫米波通信领域。这一方法可能为实现更高效、更灵活的光无线通信系统提供新的途径。

10 Gb/s 16-quadrature amplitude modulation signal

delivery over a wireless fiber system by using a directly

modulated laser for electrical/optical conversion

Lun Zhao (赵伦) and Jianguo Yu (余建国)*

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

*Corresponding author: yujg@bupt.edu.cn

Received November 21, 2014; accepted April 8, 2015; posted online May 4, 2015

We propose and experimentally demonstrate a novel scheme to realize electrical/optical (E/O) conversion on the

receiver side of a wireless fiber integration system at the W band. At the receiver, a directly modulated laser

(DML) is used to realize E/O conversion. The received 85 GHz wireless millimeter-wave (mm-wave) signal is first

down-converted into a 10 GHz electrical intermediate-frequency (IF) signal to overcome the insufficient band-

width of the subsequent DML. Then, two cascaded electrical amplifiers (EAs) are employed to boost the elec-

trical IF signal before it is used to drive a DML. By using this scheme, we transmit a 10 Gb/s 16 quadrature

amplitude modulation (16QAM) signal over a 10 m wireless link, and then deliver it over a 2 km single-mode

fiber-28 (SMF-28) wire link with a bit error ratio (BER) that is less than the hard-decision forward error

correction threshold of 3.8 × 10

−3

. Our experimental results show that the DML is good device to be used

for the E/O conversion of a 16QAM signal.

OCIS codes: 060.0060, 060.2840, 060.5625, 060.3510.

doi: 10.3788/COL201513.060601.

It is known to us that fourth-generation (4G) mobile com-

munications can provide a data rate ranging from 100 to

150 Mb/s. Furthermore, fifth-genera tion (5G) mobile

communications, which are currently being researc hed,

will support multi-gigabit or tens-of-gigabit per second

data transmission with huge bandwidth and massive

multiple-input and multiple-output (MIMO) technology.

This means that the future mobile or wireless communi-

cations can provide the same capacity as a baseband

optical communications system. This will provide a cost-

effective solution for a future wireless-fiber seamless inte-

gration network and future data interconnects. Lately, the

wireless-fiber seamless integration system based on an

optical multilevel, modulated, and heterodyne-detected

technique has attracted the interest of more and more peo-

ple, as it can provide high-speed mobile backhaul between

wireless macro stations, as well as emergency services

when la rge-capacity, long-distance optical fibers are cut

during natural disasters, such as tsunamis and earth-

quakes. High-speed, seamlessly integra ted wirele ss-fiber

transmissions such as the 100 G and 400 G integration sys-

tems have been intensively studied in the research commu-

nity by adopting the technologies of polarization division

multiplexing, multilevel quadrature amplitude/phase

modulation, photonic millimeter-wave (mm-wave) gener-

ation, MIMO, and advanced digital signal processing

(DSP) algorithms

[1–7]

. However, in the previous cases

[1–7]

the generated multilevel modulated wireless mm-wave

signal is electronically demodulated and has a limited ra-

dio-frequency (RF) transmission distanc e due to the high

mm-wave carrier frequency. In addition, the demodula-

tion of a wireless mm-wave signal in the electrical domain

will become more complicated with the increase in the bit

rate and mm-wave carrier frequency. Sambaraju et al.

[8]

proposed a RF-transparent wireless-fiber integration sys-

tem in which the wireless mm-wave signal is up-converted

into the optical domain. Then, the converted optical

signal can be directly transmitted in the fiber and demodu-

lated in the optical domain by coherent detection. Ad-

vanced DSP algorithms could be adopted to remove the

wired and wireless transmission impairments, including

chromatic dispersion (CD), polarization mode dispersion,

nonlinearity, the wireless multi-path effect, component

filtering, and so on

[1]

As noted above, a wireless optical fiber can be used to

seamlessly integrate an optical/wireless system to meet

the bandwidth requirement. We can increase the spectrum

efficiency by using a high-order modulation format,

such as 16-quadrature amplitude modulation (16QAM).

People have demonstrated that the intensity or the phase

modulator can be used for realizing electrical/optical

(E/O) conversion at the receiver side for a wireless-fiber

connection

[9–12]

. As far as we know, reducing both the size

and cost are important in a seamlessly integrated wireless

optical fiber system. A directly modulated laser (DML)

has a small size, low cost, and a small driving voltage

[13]

It is necessary for us to investigate whether an integrated

wireless-fiber system can realize E/O conversion by a

DML on the receiver side. In this Letter, we propose a

wireless-fiber integration system in which the E/O conver-

sion is based on the DML. We demonstrate that a DML

can be used for E/O conversion on the receiver side. Up to

a 10 Gb/s 16QAM signal can be delivered over a 10 m

wireless link at 85 GHz. Then, the DML is used for

xE/O conversion. A photo-detector (PD) is used for O/E

conversion after a 2 km single-mode fiber-28 (SMF-28)

COL 13(6), 060601(2015) CHINESE OPTICS LETTERS June 10, 2015

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