使用稳定多纵模布里渊/SOA光纤激光器的对称10 Gb/s WDM-PON上游无色源

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"10 Gb/s 对称WDM-PON使用稳定的多纵模布里渊/半导体光纤激光器作为无色上游源" 在光通信领域，一种名为"10 Gb/s 对称WDM-PON（波分复用无源光网络）使用稳定的多纵模布里渊/半导体光纤激光器（BSFL）作为上游无色源"的技术被提出。这种创新方案旨在提升双向单光纤WDM-PON的性能。在这样的网络中，下游波长被用作BSFL的泵浦光源。通过这种方法，一个约10.8 GHz的布里渊频移上游载波被生成，其主要目的是抑制瑞利后向散射以及由反向反射引起的交叉干扰。布里渊光纤激光器是一种结合了布里渊散射和半导体光学放大器（SOA）的特殊激光器，它的稳定多纵模操作是由于四波混频效应（FWM）所导致的。四波混频是一个非线性光学过程，在光纤中，当多个光波在特定条件下相互作用时，可以产生新的频率成分。在这种情况下，它有助于保持BSFL的稳定运行状态，从而提供可靠的上游信号源。在WDM-PON系统中，对称设计意味着上行和下行数据速率相同，都是10 Gbps。上游信号（从用户端到中心节点）的传输是一个关键挑战，因为需要避免信号间的干扰。BSFL生成的10.8 GHz布里渊频移上游载波能够有效地将信号与瑞利后向散射信号区分开，减少反向反射造成的串扰，从而提高网络的整体效率和可靠性。此外，使用无色（或称为“色散不敏感”）上游源的一个优势在于，它降低了对特定波长的依赖，增加了网络的灵活性和可扩展性。这意味着网络运营商可以更方便地调整和管理光谱资源，以适应不断变化的用户需求和未来技术的发展。这项技术通过引入稳定的多纵模布里渊/半导体光纤激光器，为10 Gb/s对称WDM-PON提供了一种高效、低串扰的上游信号源解决方案，这对于优化光网络性能、提升带宽利用率以及支持大规模的宽带接入服务具有重要意义。

COL 9(12), 120603(2011) CHINESE OPTICS LETTERS December 10, 2011

10 Gb/s symmetric WDM-PON using stable

multi-longitudinal mode Brillouin/SOA fiber laser as

upstream colorless source

Lilin Yi (ÂÂÂnnn)

1∗

, Zhengxuan Li (oooààà)

, Tao Zhang (ÜÜÜ 777)

, Dong Lin ( ÀÀÀ)

Yi Dong (ÂÂÂ ÀÀÀ)

, and Weisheng Hu (¥¥¥))))

State Key Lab of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering,

Shanghai Jiao Tong University, Shanghai 200240, China

Oclaro Shanghai R&D Center, Shanghai 200533, China

∗

Corresp onding author: lilinyi@sjtu.edu.cn

Received June 14, 2011; accepted August 15, 2011; posted online October 24, 2011

We prop ose a stable multi-longitudinal Brillouin/semiconductor fiber laser (BSFL) as the upstream source

in a bidirectional single-fiber wavelength-division multiplexing-passive optical network (WDM-PON). The

downstream wavelength serves as the pump of the BSFL. Brillouin-frequency-shifted (∼10.8 GHz) upstream

carrier is generated to suppress the Rayleigh backscattering and back reﬂection-induced crosstalk. The

stable multi-longitudinal operation of the BSFL, attributed to the four-wave mixing (FWM) effect in the

semiconductor optical amplifier (SOA) reduces the difficulty of generating a stable single-longitudinal

fiber laser-based upstream carrier. Bidirectional symmetric transmission at 10 Gb/s over a 12.5-km single

mo de fiber with less than 2-dB power penalty is demonstrated.

OCIS codes: 060.2330, 060.4265.

doi: 10.3788/COL201109.120603.

Bandwidth demand in access networks has increased

rapidly. As a result, wavelength-division multiplexing-

passive optical network (WDM-PON) has become a

promising option because of its high bandwidth accessi-

ble property. The colorless optical network unit (ONU) is

one of the main research topics in this field. Centralized

light sources in the optical line terminal (OLT) have been

considered as a good solution. In OLT, the downstream

wavelength is reused at the ONU for upstream data

modulation

[1]

or another set of laser sources differing

from the downstream ones are specifically assigned to

upstream carriers

[2]

. The wavelength reuse techniques

are limited by the Rayleigh backscattering and back

reﬂection-induced crosstalk in a single-fiber bidirectional

transmission scenario

[3]

, resulting in a power penalty

of 5–9 dB

[4]

. Adoption of two-fiber system becomes

necessary although it increases the system deployment

difficulty. Furthermore, two sets of laser sources in the

OLT will increase the system cost.

Complicated modulation schemes have been adopted

to generate the frequency difference between the

downstream and upstream wavelengths which is in-

tended to suppress the Rayleigh backscattering-induced

crosstalk

[2,4−6]

. A hybrid single longitudinal mode Bril-

louin/erbium fiber laser (BEFL) has been proposed to

mitigate the Rayleigh backscattering and back reﬂection-

induced crosstalk by frequency-shifting the downstream

wavelength away by ∼0.08 nm using a stimulated Bril-

louin scattering (SBS) effect for the upstream carrier. A

1.25-Gb/s symmetric transmission over a 20-km single

mode fiber (SMF) has been demonstrated

[7]

. However,

the single-longitudinal operation is relatively difficult to

realize. Mode-hopping is unavoidable due to environmen-

tal ﬂuctuations, which limit its practical applications.

Furthermore, the BEFL is mainly operated around the

gain peak of the erbium-doped fiber (EDF) of ∼1 558

nm and the wavelength tunable range is only several

nanometers

[8]

. Therefore, achieving a colorless ONU re-

quires a tunable filter to tune the output wavelength of

the BEFL. This increases ONU costs.

In this letter, we propose a hybrid multi-longitudinal

mode Brillouin/semiconductor fiber laser (BSFL) where

a semiconductor optical amplifier (SOA) is incorporated

to Brillouin fiber laser. This serves as the colorless

upstream source for Rayleigh backscattering and back

reﬂection-induced crosstalk mitigation. A stable multi-

longitudinal mode operation of the BSFL is achieved due

to the four-wave mixing (FWM) effect of the SOA, which

enables high-speed upstream data modulation and trans-

mission. Moreover, the effect reduces the difficulty of

generating a single longitudinal mode fiber laser. The

BSFL can operate within the entire gain bandwidth of

the SOA

[9]

and the output wavelength is only determined

by the downstream wavelength. Therefore, it is a color-

less laser source that does not require a tunable filter. In

this letter, the bidirectional symmetric transmission of

non-return-to-zero (NRZ) data at 10 Gb/s over 12.5-km

SMF has been demonstrated with less than 2-dB power

penalty using the BSFL as the upstream source. It should

be noted that the proposed scheme is effective on any

downstream signal with a strong carrier, such as quad-

rant amplitude modulation (QAM) and orthogonal fre-

quency division multiplexing (OFDM) signals.

A bidirectional single-fiber WDM-PON architecture

employing the BSFL as upstream source is depicted in

Fig. 1. The ONU consists of an optical circulator (OC),

BSFL, a downstream optical receiver, and an upstream

Mach–Zehnder modulator (MZM). The downstream sig-

nal is launched into the BSFL through the OC to serve as

the Brillouin pump. The BSFL has two outputs, namely,

1671-7694/2011/120603(4) 120603-1

° 2011 Chinese Optics Letters

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使用稳定多纵模布里渊/SOA光纤激光器的对称10 Gb/s WDM-PON上游无色源

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