Widely tunable continuous-wave InGaAsP/InP sampledgrating lasers

Jayaraman, V.; Heimbuch, M.E.; Coldren, L.A.; DenBaars, Steven P.

doi:10.1049/el:19941016

Cited by 27 publications

(17 citation statements)

References 4 publications

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“…The four transition energies used in (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) can be determined by momentum conservation and are given by (2-26). The conduction band and valence band energies are given relative to the respective band edges.…”

Section: 'mentioning

confidence: 99%

“…The signal is split and fed to the array elements using a combination of non-dispersive and highly dispersive fiber of varying lengths such that the time delay is matched for all of the elements at a particular wavelength. Recently there has been a great deal of research on new widely tunable semiconductor lasers which use Vernier effect tuning mechanisms to enable them to tune over more than 60 nm [13]. An example of these is the sampled grating DBR laser.…”

Section: Phased Array Radar Beam Steeringmentioning

confidence: 99%

“…Recently there has been a great deal of research on new widely tunable semiconductor lasers which use Vernier effect tuning mechanisms to enable them to tune over more than 60 nm [13]. An example of these is the sampled grating DBR laser.…”

Section: Phased Array Radar Beam Steeringmentioning

confidence: 99%

“…This intra-band free-carrier absorption, also known as the plasma effect, can be modeled as being directly proportional to the concentration of electrons and holes and to the square of the wavelength. The corresponding change in refractive index is given by (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). This equation uses the fact that the concentrations of the heavy and light holes are proportional to their effective masses raised to the three-halves power [20].…”

Section: Free-carrier Absorptionmentioning

confidence: 99%

“…The absorption constant C depends on the material and can be estimated for In^xGaxASyPi.y materials lattice matched to InP (x « 0.47y) using (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18).…”

Section: Band Filling and Bandgap Shrinkagementioning

confidence: 99%

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Improved Sampled Grating DBR Widely-Tunable 1.55 micrometer Lasers

Coldren¹,

Mason²

1997

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Over the last three years, a number of improvements have been made in the design of SGDBR lasers with integrated componentry. Device design has improved the output power and tuning range due to an increase in the number of quantum wells in the active region from four to six. Devices with up to 8 mW of output power with integrated amplifiers and buried heterostructure devices with 72 nm tuning ranges were realized. Current laser results indicate that leakage current in buried heterostructure lasers is a major factor in limiting the device performance. To eliminate the parasitic leakage paths we have begun to investigate Fe doped blocking junctions for the device. Work on the wavelength monitor has focused on an external approach, which uses a wavelength dependent coupler in conjunction with a pair of photodetectors. Initial results show better than 1 nm sensitivity over a 30 nm range. The most recent work on the laser has focussed on integrating additional components for increased functionality. We have developed a curved waveguide semiconductor optical amplifier that can be integrated with the laser to increase the output power to greater than 6 mW.We have also investigated SGDBR lasers with integrated electro-absorption modulators. Using a 300 urn long bulk EA modulator we have demonstrated error free data transmission at 2.5 GBit/s with a 2 3I -1 pattern length at received powers of-32.5 dBm. Subject termsSemiconductor lasers, photonic integrated circuits, wavelength monitors, WDM devices, semiconductor optical amplifiers, electro-absorption modulators IntroductionThe goal of this program was to develop a widely tunable semiconductor laser diode with an integrated wavelength monitor. The widely tunable laser is a four section device with a pair of sampled grating distributed Bragg reflector mirrors as shown in figure 1. These devices use a Vernier effect tuning mechanism to provide widely tunable wavelength ranges. Because of the simple offset waveguide design, SGDBR lasers are easily integrated with other optoelectronic devices such as wavelength monitors, optical amplifiers, and modulators to form photonic integrated circuits. They employ periodically sampled grating mirrors which have multiple reflection peaks spaced approximately 5-7 nm apart. The duty cycle and sampling periods have been optimized for the desired wavelength coverage. A phase control section is included to enable alignment of the cavity mode with the mirror reflection peaks. Devices were fabricated using both ridge and buried ridge waveguide processes with passive regions formed by a combination of etching and MOCVD regrowth.This work is discussed in detail in Dr. T.G.B Mason's dissertation -which is included as Appendix I. Supplementary material outlining work on semiconductor optical amplifiers (SOAs) and Electro-absorption modulators (EAM) is also included in the report. Thesis summaryFirst we will briefly summarize the key results from Dr. Mason's dissertation. In appendix I, Dr. Mason discusses the design and development of ph...

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