Control of dual-wavelength laser emission viaoptical feedback phase tuning

IF 1.1 Q4 OPTICS Optics continuum Pub Date : 2023-10-03 DOI:10.1364/optcon.502550
Robert Pawlus, Stefan Breuer, Martin Virte
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引用次数: 2

Abstract

We propose and demonstrate a technique to control the balance between the two amplitudes of a dual-wavelength laser based on a phase-controlled optical feedback. The feedback cavity length is adjusted to achieve a relative phase shift between the desired emission wavelengths, introducing a boost in gain for one wavelength while the other wavelength experiences additional losses. Tuning the optical feedback phase proves to be an effective way to control the gain and losses, and, thus, to select one or balance the amplitude of the two emission wavelengths. This concept can be easily adapted to any platform, wavelength range and wavelength separations providing that a sufficient carrier coupling and gain can be obtained for each mode. To demonstrate the feasibility and to evaluate the performance of this approach, we have implemented two dual-wavelength lasers with different spectral separations together with individual optical feedback loops onto a InP generic foundry platform emitting around 1550 nm. An electro-optical-phase-modulator is used to tune the feedback phase. With this single control parameter, we successfully achieved extinction ratios of up to 38.6 dB for a 10 nm wavelength separation and up to 49 dB for a 1 nm wavelength separation.
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双波长激光发射的光反馈相位调谐控制
我们提出并演示了一种基于相位控制光反馈的技术来控制双波长激光器的两个振幅之间的平衡。反馈腔的长度被调整,以实现期望的发射波长之间的相对相移,引入一个波长的增益提升,而另一个波长经历额外的损失。调整光反馈相位被证明是一种有效的方法来控制增益和损耗,从而选择一个或平衡两个发射波长的振幅。这个概念可以很容易地适应任何平台,波长范围和波长分离,提供足够的载流子耦合和增益可以为每个模式。为了证明该方法的可行性并评估其性能,我们在InP通用代工平台上实现了两个具有不同光谱分离的双波长激光器以及单独的光反馈回路,其发射波长约为1550 nm。电光相位调制器用于调整反馈相位。通过这个单一的控制参数,我们成功地实现了10nm波长分离时高达38.6 dB的消光比和1nm波长分离时高达49 dB的消光比。
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CiteScore
3.50
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0.00%
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