Strategy of optical negative feedback for narrow linewidth semiconductor lasers

Aoyama, Konosuke; Yokota, Nobuhide; Yasaka, Hiroshi

doi:10.1364/oe.26.021159

Cited by 14 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…tical feedback reduces the high-frequency components of laser noise above 3 kHz by approximately 25 dB, in agreement with previous results [9,20]. However, this comes at a price: the laser noise increases significantly below 1 kHz because the length of the external fiber-based cavity is easily affected by low-frequency acoustical noise.…”

Section: Laser Noise Measurementsupporting

confidence: 91%

Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback

Yamoah¹,

Braverman²,

Pedrozo-Peñafiel³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

We demonstrate a combination of optical and electronic feedback that significantly narrows the linewidth of distributed Bragg reflector lasers (DBRs). We use optical feedback from a long external fiber path to reduce the high-frequency noise of the laser. An electro-optic modulator placed inside the optical feedback path allows us to apply electronic feedback to the laser frequency with very large bandwidth, enabling robust and stable locking to a reference cavity that suppresses lowfrequency components of laser noise. The combination of optical and electronic feedback allows us to significantly lower the frequency noise power spectral density of the laser across all frequencies and narrow its linewidth from a free-running value of 1.1 MHz to a stabilized value of 1.9 kHz, limited by the detection system resolution. This approach enables the construction of robust lasers with sub-kHz linewidth based on DBRs across a broad range of wavelengths.

show abstract

Section: Laser Noise Measurementsupporting

confidence: 91%

Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback

Yamoah¹,

Braverman²,

Pedrozo-Peñafiel³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

show abstract

“…We previously proposed the optical negative feedback as a novel linewidth reduction scheme to realize a compact narrow-linewidth semiconductor laser. [24][25][26][27][28] The scheme does not require increasing the Q factor of the laser cavities. It requires only a single-mode semiconductor laser and an optical filter.…”

mentioning

confidence: 99%

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Aoyama

Kobayashi

Wada

et al. 2018

Appl. Phys. Express

Self Cite

View full text Add to dashboard Cite

A compact narrow-linewidth semiconductor laser is demonstrated by hybridly integrating an optical filter constructed from Si waveguides with a single-mode semiconductor laser, whose spectral linewidth is narrowed through optical negative feedback. We design the optimum structure of a reflective ring filter for an optical negative feedback laser, and a narrow spectral linewidth of 160 kHz is realized by the hybridly integrated laser source whose effective device length is less than 1.5 mm.

show abstract

“…Reduced frequency fluctuations under condition (v) ( f 1 = f 2 = 10 GHz) are confirmed, while sustained fluctuations occur under condition (vi) ( f 1 = f 2 = -10 GHz). These detuning-dependent frequency fluctuations and their convergence have an analogy with positive or negative optical feedback effects in a semiconductor laser coupled with a frequency discriminator [41]. Since the frequency fluctuation is converted into amplitude fluctuation by the ring resonator, the lasing frequencies of the DMLs are mutually modulated through the stimulated emission and carrier plasma effect in the laser cavity.…”

Section: Mutual Injection-locking Condition and Transient Responsementioning

confidence: 96%

Numerical Investigation of Mutually Injection-Locked Semiconductor Lasers for Direct IQ-Signal Generation

et al. 2019

Self Cite

View full text Add to dashboard Cite

A novel configuration of mutually injection-locked directly modulated lasers (DMLs) for generating in-phase quadrature (IQ) optical signals is proposed and numerically investigated by using rate equations. Two DMLs coupled with a high-Q ring resonator (Q = 2.2 × 10 5) are used for obtaining stable mutual-injection locking and suppression of the optical carrier component. First, conditions for mutual injection locking and modulation responses are investigated. Lasing frequencies are pulled toward the resonant frequency of the ring resonator due to the filtered mutual optical injections, and the pulling range is much broader than the transmission bandwidth of the ring resonator. Modulation bandwidth of the DMLs under the mutual-injection-locking condition is enhanced compared to that of the DMLs under the free-running condition. A resonant feature depending on the detuning condition appears in the modulation response, and it can be reproduced by the conventional injection-locking model. Next, optical-signal generations with quadrature phase shift keying (QPSK) format are tested under the assumption that the mutually injection-locked DMLs are driven by pseudo-random bit sequences. It is confirmed that 80-GBd QPSK modulation with back-to-back error vector magnitude of 32% can be achieved by using 8B/10B encoding.

show abstract

Strategy of optical negative feedback for narrow linewidth semiconductor lasers

Cited by 14 publications

References 24 publications

Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback

Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback

Compact narrow-linewidth optical negative feedback laser with Si optical filter

Numerical Investigation of Mutually Injection-Locked Semiconductor Lasers for Direct IQ-Signal Generation

Contact Info

Product

Resources

About