1.3 μm distributed feedback laser diode with grating accurately controlled by new fabrication technique

Takemoto, A.; Ohkura, Y.; Kawama, Y.; Kimura, Tadashi; Yoshida, N.; Kakimoto, S.; Susaki, W.

doi:10.1049/el:19890157

Cited by 11 publications

(4 citation statements)

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“…The Ith of 16.84 mA is slightly lower than the 17.9 mA reported in [5]. This may due to the higher value of KL = 1.37 in this work compared with KL = 0.5 in [5].…”

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confidence: 62%

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<title>Optimization of grating depth and layer thicknesses for DFB lasers</title>

et al. 1991

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The novel concept of K-stabilizing layer is reported for the first time. The coupling coefficient(K) which determines the characteristics of distributed feedback laser diodes(DFB LD's) has been controlled by optimizing the grating depth and layer thicknesses. The coupling coefficient is less dependent on the variations of grating depth and layer thicknesses if an optindzed K-stabilizing layer(lower index material like InP) is inserted between the active layer and the guide layer. The controllability of the coupling coefficient has been demonstrated by the standard deviation of the lasing wavelength and the threshold current across a wafer, 0.74 nm and 2.67 mA, respectively.

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“…The Ith of 16.84 mA is slightly lower than the 17.9 mA reported in [5]. This may due to the higher value of KL = 1.37 in this work compared with KL = 0.5 in [5].…”

contrasting

confidence: 62%

“…1) is highly dependent on the grating depth and layer thicknesses. The exact theoretical calculation and technique used to control the coupling coefficient has seldom been reported [5]. In this paper, an optimized K-stabilizing InP layer is reported.…”

mentioning

confidence: 99%

<title>Optimization of grating depth and layer thicknesses for DFB lasers</title>

et al. 1991

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“…The lateral confinement is assumed to be buried heterostructure. An InP buffer layer is inserted between the grating layer and the multiple quantum well active layer such that the grating depth is accurately controlled by the growth instead of by chemical etching [25]. The Bragg wavelength is assumed to be 1552 nm.…”

Section: A Laser Array Overviewmentioning

confidence: 99%

Multiwavelength DFB laser array transmitters for ONTC reconfigurable optical network testbed

Lee¹,

Zah²,

Bhat³

et al. 1996

J. Lightwave Technol.

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We discuss the design, fabrication, and performance of experimental multiwavelength laser array transmitters that have been used in the reconfigurable optical network testbed for the Optical Network Technology Consortium (ONTC). The experimental four-node multiwavelength network testbed is SONET/ATM compatible. It has employed multiwavelength DFB laser arrays with 4 nm wavelength spacing for the first time. The testbed has demonstrated that multiwavelength DFB laser arrays are indeed practical and reproducible. For the DFB laser arrays used in such a network the precise wavelength spacing in the array and the absolute wavelength control are the most challenging tasks. We have obtained wavelength accuracy better than &0.35 nm for all lasers, with some registered to better than 10.2 nm. We have also studied the array yield of our devices and used wavelength redundancy to improve the array yield. Coupling efficiencies between -2.1 to -4.5 dB for each wavelength channel have been obtained. It is achieved by using specially designed lensed fiber arrays placed on a silicon V-grooved substrate to exactly match the laser spacing. The transmitter consisted of a multichip module containing a DFB laser array, an eight-channel driver array based on GaAs IC's, and associated RF circuitry.

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“…The shallow grating needed to obtain an optimum low K L for long lasers is difficult to fabricate with sufficient precision without the use of a separate grating layer [17]. This is mainly due to the problem of measuring the depth of a shallow grating from a SEM picture.…”

Section: B Multiple Phase-shifted Dfb Lasermentioning

confidence: 99%

Investigation on the spectral characteristics of DFB lasers with different grating configurations made by electron-beam lithography

Kjellberg

Nilsson

Klinga

et al. 1993

J. Lightwave Technol.

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The single-mode stability for DFB lasers with various e-beam-written grating configurations has been investigated theoretically and experimentally, both for as-cleaved and ARcoated lasers. Other laser properties interesting for coherent and multichannel communications systems such as linewidth and tunability have also briefly been investigated. Lasers with more sophisticated grating structures, such as an optimized multiple phase-shifted or a corrugation-pitch-modulated grating, did not exhibit any performance significantly superior to X/4-shifted DFB lasers with an appropriate coupling coefficient. AR-coating of the end facets proved indispensable to obtain a high yield of lasers with single-mode operation at high output power and to reduce the large chip-to-chip variation seen for the as-cleaved lasers. A theoretical investigation dealing with the effect of end reflections on the stop-band and the problem to determine the coupling coefficient was also made.

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1.3 μm distributed feedback laser diode with grating accurately controlled by new fabrication technique

Cited by 11 publications

References 0 publications

<title>Optimization of grating depth and layer thicknesses for DFB lasers</title>

<title>Optimization of grating depth and layer thicknesses for DFB lasers</title>

Multiwavelength DFB laser array transmitters for ONTC reconfigurable optical network testbed

Investigation on the spectral characteristics of DFB lasers with different grating configurations made by electron-beam lithography

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