Continuous-wave room temperature operation of bipolarcascade laser

Patterson, Steven G.; Petrich, G.S.; Ram, Rajeev J.; Kolodziejski, L. A.

doi:10.1049/el:19990285

Cited by 40 publications

(16 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Scaling method (a) is used in bipolar tunnel diode cascade and unipolar quantum cascade lasers, and scaling method (b) is used in bipolar segmented waveguide cascade lasers [2][3][4][5]10]. In method (a), the total impedance of all the gain stages scales as N Z d , where Z d is the impedance of a single gain stage.…”

Section: Scaling In Semiconductor Cascade Lasersmentioning

confidence: 99%

“…Since impedance is inversely proportional to area, the impedance of each gain We also make the reasonable assumption that the output power of a cascade laser increases linearly with the increase in the total volume of the laser cavity. This implies that both the output power and the cavity volume scale as N α , where α = 1 for bipolar tunnel diode cascade lasers and 0 for unipolar quantum cascade lasers and bipolar segmented waveguide cascade lasers [3][4][5][6]. Since the output power of an N -stage cascade laser is given by the expression [2-6, 10]…”

Section: Scaling In Semiconductor Cascade Lasersmentioning

confidence: 99%

“…Figure 1 shows a bipolar segmented waveguide cascade laser [3] in which a conventional laser waveguide is segmented into smaller sections that are connected electrically in series. Figure 2 shows a bipolar tunnel diode cascade laser [4,5] in which multiple PN junctions are connected electrically in series through reversed biased tunnel diodes. Figure 3 shows a unipolar intersubband quantum cascade laser [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scaling of the photon noise in semiconductor cascade lasers

Rana

Mayer

Ram

2004

J. Opt. B: Quantum Semiclass. Opt.

View full text Add to dashboard Cite

Semiconductor cascade lasers have larger photon noise than conventional semiconductor lasers as a result of positive correlations in photon emission in different gain stages which are connected electrically in series. The photon noise of a cascade laser can be related to the photon noise of a single-stage laser with a scaled external circuit impedance. This scaling relation for the photon noise holds for bipolar as well as unipolar cascade lasers.

show abstract

Section: Scaling In Semiconductor Cascade Lasersmentioning

confidence: 99%

Section: Scaling In Semiconductor Cascade Lasersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Scaling of the photon noise in semiconductor cascade lasers

Rana

Mayer

Ram

2004

J. Opt. B: Quantum Semiclass. Opt.

View full text Add to dashboard Cite

show abstract

“…Several approaches have been proposed to increase the modulation efficiency of semiconductor lasers, including gain-lever modulation [5][6][7] and cascaded lasers [8][9][10][11]. Cascaded lasers achieve higher efficiency by recycling the RF modulating current through multiple lasers connected in series.…”

Section: Introductionmentioning

confidence: 99%

“…This was due to the parasitics of the series-connected lasers. To realize a bandwidth closer to the individual components, monolithically-integrated versions were proposed using surface-emitting [9] and edge-emitting lasers [10,11]. Improved link performance exhibiting > 100% differential efficiency and a spuriousfree dynamic range (SFDR) of 120 dBㆍHz 2/3 operating at 500 MHz has been demonstrated [10].…”

Section: Introductionmentioning

confidence: 99%

Amplitude Modulation Response and Linearity Improvement of Directly Modulated Lasers Using Ultra-Strong Injection-Locked Gain-Lever Distributed Bragg Reflector Lasers

Sung

2008

Journal of the Optical Society of Korea

View full text Add to dashboard Cite

Directly modulated fiber-optic links generally suffer higher link loss and larger signal distortion than externally modulated links. These result from the electron-photon conversion loss and laser modulation dynamics. As a method to overcome the drawbacks, we have experimentally demonstrated the RF performance of directly modulated, ultra-strong injection-locked gain-lever distributed Bragg reflector (DBR) lasers. The free-running DBR lasers exhibit an improved amplitude modulation efficiency of 12.4 dB under gain-lever modulation at the expense of linearity. By combining gain-lever modulation with ultra-strong optical injection locking, we can gain the benefits of both improved modulation efficiency from the gain-lever effect, plus improved linearity from injection locking. Using an injection ratio of R=11 dB, a 23.4-dB improvement in amplitude response and an 18-dB improvement in spurious-free dynamic range have been achieved.

show abstract

Direct Modulation for Microwave Photonics

Iezekiel

2009

Microwave Photonics

View full text Add to dashboard Cite

Today, nearly 100 companies are involved in the transport of RF or microwave signals over fibre optics -primarily a modulated RF carrier residing on the optical signal. The applications for such systems range from in-building distribution of wireless signals (for example in shopping malls and tunnels), wireline interconnections between base stations and microcellular antennas, antenna remoting for various commercial (wing-tip antennas in aircraft) and military radar systems and broadcasting of cable television signals in both hybrid fibre coax (HFC) and triplexer based fibre-to-the-home (FTTH) systems. The simplest, lowest cost and hence most widely deployed system consists of a directly modulated laser, a length of optical fibre and a detector. This simple link is referred to as an intensity modulation/direct detection (IM/DD) system in contrast to externally modulated systems. While direct modulation links tend to be simpler and cheaper, generating and modulating the photons in a single device -the laser -clearly entails compromises in overall performance that can be avoided by separating these functions as in an externally modulated link. In particular, the effect of nonlinearity and noise must be considered (Figure 2.1). However, as we shall show here, the performance gap between externally modulated and directly modulated links can be narrowed with judicious design of the semiconductor laser.As in all optical systems, the performance requirements for the individual components are set by the overall system specifications. For analogue IM/DD links, the three most important system parameters for specifying optical components are unamplified link gain (typically À25 dB, best case þ 6 dB), unamplified link noise figure (typically 40 dB, best case 17 dB) and spurious free dynamic range (typically 100 dB-Hz 2/3 , best case 127 dB-Hz 2/3 ). The link gain is a simple function of the efficiency with which the laser can convert an electrical signal to a modulated optical waveform, the optical transmission loss and the efficiency for a detector to Microwave Photonics: Devices and Applications Edited by Stavros Iezekiel

show abstract

Continuous-wave room temperature operation of bipolarcascade laser

Cited by 40 publications

References 6 publications

Scaling of the photon noise in semiconductor cascade lasers

Scaling of the photon noise in semiconductor cascade lasers

Amplitude Modulation Response and Linearity Improvement of Directly Modulated Lasers Using Ultra-Strong Injection-Locked Gain-Lever Distributed Bragg Reflector Lasers

Direct Modulation for Microwave Photonics

Contact Info

Product

Resources

About