Summary form only given. Here we report the first penalty-free transmission results over 48 km of nondispersion-shifted fiber using a 1.3-/spl mu/m wavelength integrated electroabsorption modulated MQW laser (EML) device at a bit rate of 10 Gbit/s.

The first monolithically integrated DFB laser/Mach-Zehnder interferometric modulator fabricated by the selective area low pressure MOVPE growth technique is reported. A near 3-dB power divider at the Y-branches of the interferometer has been reproducibly achieved by a photolithographically defined dielectric mask used in the selective area growth technology and confirmed by an infrared near field imaging technique. A modulation depth of over 12 dB was achieved both in the forward and reverse bias to the arms of the phase modulator.< >

We have demonstrated the first monolithic integration of a DFB laser with a Mach-Zehnder type modulator fabricated by the selective area MOVPE growth technique and operating at 1.55 μm. A spatially resolved micro photoluminescence setup was used to characterize the crystal quality. We have achieved a low loss and near 3 dB Y-branch power divider in the structure with the modulator achieving an attenuation up to 17 dB and a π phase shift voltage of 2 V

Optical transmitters with monolithically integrated electroabsorption-modulator/DFB lasers (EMLs) are expected to be key components in future lightwave transmission systems. The low chirp of these devices makes them well suited for long-haul (500 km) 2.5-Gbit/s transmission systems that make use of existing standard fiber and erbium-doped fiber amplifiers (EDFAs).1 Recently, several groups have also reported transmission at 10 Gbit/s over 50 km of standard fiber,2 which is the theoretical dispersion limit, as well as over longer spans by using dispersion-shifted fiber3,4 or nonlinear dispersion compensation.2 However, many of these devices have a butt-joined waveguide structure and/or use polyimide dielectrics to reduce the parasitic capacitance of the modulator,2,3 both of which are serious concerns for manufacturability and long-term reliability.

A packaged hybrid soliton pulse source is used in a soliton transmission experiment employing sliding-frequency guiding filters. The source shows excellent stability and very clean tuning characteristics. Control of the operating frequency and wavelength are described. Error free transmission at 10 GBit/s is achieved over a distance of 27000 km.< >

Recently, a method of pulse generation has been demonstrated in which a sinusoidally driven electroabsorption modulator optically gates the output of a cw laser, producing transform-limited pulses.1 With this technique, integrated laser/modulators initially developed as non-return-to-zero (NRZ) data transmitters can serve as compact pulse sources with tunable repetition rate, wavelength, and pulse width, well suited to soliton and optical time-division-multiplexing (OTDM) applications. However, an additional modulator is required to encode data onto the pulse stream, adding cost and insertion loss to the transmitter. Wakita et al.2 have added the function of data encoding to a faser/modulator pulse source by integrating a second modulator, thereby increasing the complexity of the chip. Raybon et al. have performed integrated data encoding by directly modulating the laser with NRZ data; however, a small amount of chirp is added by this technique.

Summary form only given. 2.5 Gbit/s transmission over 517 km of standard fiber is reported using a monolithically integrated InGaAsP MQW EA modulator/DFB laser by selective-area MOVPE. A low chirp of 0.13 Å peak-peak and good reliability are shown

34, 17 and 14 ps pulses have been generated at repetition rates of 2.5, 5 and 10 GHz, respectively, from an integrated laser modulator at 1.5 mu m. Pulse widths were significantly reduced by modulating at both the fundamental and the second harmonic frequencies.<>

25GHz modulation bandwidth is achieved from a fully packaged 1.55 mu m DFB laser. using devices with p-doped compressively strained MQW active regions and large negative wavelength detuning. Devices on submounts show a record bandwidth of 26 GHz, limited by device and bonding parasitics. Resonance frequencies of over 26GHz are mensured.

The generation of short optical pulses at 1.5 /spl mu/m is a key issue in future communications systems. Recently, a new approach to pulse generation has been reported in which the output ofa CW laser is converted to nearly transform limited pulses by a sinusoidally driven electro-absorption modulator. This simple technique is readily integrated and provides flexibility in both operating frequency and wavelength, an important asset for soliton and optical time division multiplexing (OTDM) applications.

Summary form only given. A fully packaged hybrid soliton pulse source is described. Excellent stability and tuning characteristics are shown. Error free soliton transmission at 10 Gbit/s is achieved over 27,000 km using sliding-frequency guiding filters.

We describe hybrid lasers combining a semiconductor gain section and fiber cavity with integrated chirped Bragg reflector. These devices have produced output powers of 27.5 mW in a narrow linewidth (400 KHz) stable single longitudinal mode. The use of a chirped reflector to stabilize the single mode output, and correct grating orientation are described. The laser output has a side-mode suppression ratio of over 55 dB at 27.5 mW output, and relative intensity noise (RIN) below 160 dB/Hz.

Lasers with integrated electroabsorption (EA) modulators are showing a lot of promise as low-chirp sources for long-haul transmission systems at multigigabit-per-second speeds.1,2 There are various structures and growth techniques for making such devices.3·4 Here we demonstrate a multiple-quantum-well (MQW) DBR-LD/EA modulator in a 495-km transmission system operating at 2.5 Gbit/s.

We describe a mode-locked hybrid pulse source with a two-section laser diode to obtain short mode-locked pulses (23 ps) with an average power of 7.8 mW, a high peak power of 137 mW, and a repetition rate of 2.51 GHz. The hybrid laser incorporates a two-section laser and an optical fiber cavity with an integrated Bragg reflector. The Bragg reflector controls the operating wavelength to subnanometer precision and also confines the bandwidth of the pulses so as to keep the time-bandwidth product below 1.

The generation of short optical pulses at 1.55 μm is a key issue in future communications sytems, which will require high speed sources for soliton transmission and optical time division multiplexing (OTDM). It has recently been shown that a sinusoidally driven electroabsorption modulator can be used to convert the output of a cw laser to nearly transform-limited pulses.1–2 This simple technique is readily integrated and, unlike mode-locked sources, provides substantial flexibility in operating frequency. However, the output pulse width is, to first order, inversely proportional to the operating frequency, resulting in a limited duty cycle which could be detrimental in soliton or high speed OTDM systems.

We describe a mode-locked hybrid pulse source which produces short (23 ps) mode locked pulses with an average power of 7.8 mW, high peak power of 137 mW, at a repetition rate of 2.51 GHz. The source uses a two section laser diode to allow high peak power, in an optical fiber cavity with an integrated Bragg reflector. The Bragg reflector controls the operating wavelength to sub nanometer precision, and also confines the bandwidth of the pulses to keep the time bandwidth product below one

A device quality of selective epitaxy growth of InGaAsP/InP multiple quantum well (MQW) structure using low-pressure metalorganic vapor phase epitaxy (MOVPE) technique is described. The technique is applied to a monolithically integrated electroabsorption modulator with distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers. Superior device characteristics such as efficient modulation, low threshold current and high efficiency operation of the integrated devices are obtained.