Development of a ion-exchanged glass integrated optics DFB laser for a LIDAR application

Bastard, Lionel; Broquin, Jean-Emmanuel; Gardillou, Florent; Cassagnettes, C.; Schlotterbeck, Jean-Pierre; Rondeau, Philippe

doi:10.1117/12.811881

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…It has already been used for fluorescence detection 1 , chemical and bio-detection 2, 3 , displacement 4 or orientation measurement 5 . Applications in avionics are currently in development since the measurement of an aircraft's True Air Speed (TAS) has been recently demonstrated using a LIDAR containing several ion-exchanged integrated optics elements : seed CW-DFB laser, power splitters etc 6 ... Used for alternative on-board measurement, this system, supported by the European Community, presents modes of failures that are different from the traditional anemo-barometric module. The optical architecture of the micro-LiDAR is presented in Figure 1.…”

Section: Applicationsmentioning

confidence: 97%

Broad-area laser diode with stable single-mode output and wavelength stabilization

et al. 2012

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High power single-mode pump laser diodes operating around 980nm are key components for Erbium-doped devices. Much effort is still currently devoted to improve both their wavelength stability and their achievable output power, while maintaining a stable single-mode operation. Usually, the emission wavelength is stabilized by an external Fiber Bragg Grating (FBG). This configuration requires free-space optics between the laser diode output facet and the fiber or a lensed fiber to ensure an efficient coupling efficiency. This constraint increases fabrication costs, dimensions and mechanical instabilities. Moreover, the maximum achievable output power is limited because a high optical power density can damage the laser facets. To increase the achievable output power, a solution consists in using Broad-Area Laser Diodes (BALD), which are multimode emitters that are composed of large active ribbons with width of some hundreds of micrometers. The objective is then to improve the beam quality by locking the BALD emission on its transverse fundamental mode. We propose in this article to insert an integrated adiabatic transition between the multimode laser and a single-mode FBG. This taper, made by ion-exchange in glass, provides a coupling efficiency of -22.0dB from the multimode laser emission to the single-mode fiber. An optical feedback of -34dB demonstrates the stabilization of the BALD spectrum at the Bragg wavelength. The spectrum of the device is characterized by a maximum side-mode suppression ratio of 35dB, a RMS spectral width of (0.16 ± 0.04) nm and a frequency shift with current of -12GHz/100mA. CONTEXT ApplicationsIon-exchange on glass is a well-established technology for sensor applications. Its compactness and stability allow schemes of integration which often reduce costs of fabrication and improve performances or security. It has already been used for fluorescence detection 1 , chemical and bio-detection 2, 3 , displacement 4 or orientation measurement 5 . Applications in avionics are currently in development since the measurement of an aircraft's True Air Speed (TAS) has been recently demonstrated using a LIDAR containing several ion-exchanged integrated optics elements : seed CW-DFB laser, power splitters etc 6 ... Used for alternative on-board measurement, this system, supported by the European Community, presents modes of failures that are different from the traditional anemo-barometric module. The optical architecture of the micro-LiDAR is presented in Figure 1. The output of the 1.55µm-seed laser made by ion-exchange is split into two parts. The first one is used as a probe beam. It is amplified by a booster and

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Section: Applicationsmentioning

confidence: 97%

Broad-area laser diode with stable single-mode output and wavelength stabilization

et al. 2012

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“…It allowed producing numerous passive devices with applications ranging from optical communication duplexers [2], [3] to astronomy [4], [5] . Moreover, the use of rare-earth doped glass has allowed realizing active devices like amplifiers [6], [7] , continuous wave lasers [8], [9] and Q-switched lasers [10] . Nonetheless, there are only few studies on glass integrated optics mode-locked lasers, though this technology is very promising because of its stability, compactness and the possibility to integrate several functions on a single chip.…”

Section: Introductionmentioning

confidence: 99%

Integrated optics dissipative soliton mode-locked laser on glass

Charlet

Bastard

Broquin

2011

Integrated Optics: Devices, Materials, and Technologies XV

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Mode-lock lasers have been studied a lot in the past years for producing pulses as short as possible. These devices have mostly been realized in bulk optics and they are consequently cumbersome and sensitive to vibrations. There are only a few studies on integrated optics mode-lock lasers, though this technology is very promising because of its stability, compactness and the possibility to integrate several functions on a single chip. In this paper, we present an ion-exchange passively mode-locked laser in dissipative soliton operation. One of the key characteristics of this structure is its mechanical stability. Indeed, no bulk optics is needed because the saturable absorber is hybridized on the top of the waveguide in order to interact with the evanescent part of the guided mode. Indeed, the device that has been obtained is composed of an ion-exchanged single mode waveguide realized in a Neodymium doped phosphate glass. The laser feedback is produced by a Fabry-Perot cavity realized with two multilayers dielectric mirrors stuck on the waveguides facets. We implemented a bis(4-dimethylaminodithiobenzil)nickel (BDN) dye included in a cellulose acetate thick film, which presents a saturable absorber behaviour around 1.06 µm. With this structure, pulses with repetition rates of 3.3 GHz and a single mode output have been measured. Moreover, the use of an autocorrelation set-up allowed us measuring picosecond pulse durations.

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“…Distributed Feed Back (DFB) lasers realized by ion-exchange 1,2 on Er 3+ /Yr 3+ doped glass substrates are single mode sources with a narrow linewidth and stable emission in the third telecom window 3 . These characteristics, added to their compactness and their mW-range output power, make them convenient sources to be used in optical telecommunication systems 3 as well as in eye-safe detection system, such as LIDAR 4 . Usually, the architecture of such DFB lasers consists of an ion-exchanged waveguide and a Bragg grating etched on the glass surface, which provides the laser feedback.…”

Section: Introductionmentioning

confidence: 99%

1.55 μm hybrid waveguide laser made by ion-exchange and wafer bonding

Casale

Bucci²,

Bastard³

et al. 2012

SPIE Proceedings

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Distributed Feed Back (DFB) lasers working in the third telecom window are essential for optical communications, eyesafe sensors and lab-on-chip devices. Glass integrated optics technology allows realizing such devices by using rareearth doped substrates. Despite their good output power and spectral characteristic, DFB lasers still present some reliability issues concerning the Bragg grating protection. Moreover Erbium doped glasses are not compatible with the realization of passive optical functions. In order to solve the DFB lasers reliability issues and to ensure a monolithic integration between active and passive functions, we propose an hybrid-device architecture based on ion-exchange technology and wafer bonding. The Ag + /Na + ion-exchange in the silicate glass wafer is used to realize the passive functions and the lateral confinement of the electromagnetic field. Through a second ion exchange step, a slab waveguide is made on the Erbium-Ytterbium doped glass wafer. The Bragg grating is processed on the passive substrate and the two glasses are bonded. The potential of this structure has been demonstrated through the realization of a DFB hybrid laser with a fully encapsulated Bragg grating.

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Development of a ion-exchanged glass integrated optics DFB laser for a LIDAR application

Cited by 3 publications

References 10 publications

Broad-area laser diode with stable single-mode output and wavelength stabilization

Broad-area laser diode with stable single-mode output and wavelength stabilization

Integrated optics dissipative soliton mode-locked laser on glass

1.55 μm hybrid waveguide laser made by ion-exchange and wafer bonding

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