FM response of narrow-linewidth, multielectrode lambda /4 shift DFB laser

Ogita, S.; Kotaki, Y.; Matsuda, M.; Kuwahara, Yuji; Onaka, H.; Miyata, H.; Ishikawa, Hideaki

doi:10.1109/68.50876

Cited by 34 publications

(4 citation statements)

References 10 publications

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“…The power variance of E S with the frequency modulation was less than 0.1 dB owing to the highly efficient FM-response of the three-electrode DFB-LD [52]. With this SBS suppression technique, SBS was almost completely suppressed to the Rayleigh scattering level (open triangles).…”

Section: Dispersion-decreasing Dcfmentioning

confidence: 86%

“…A time-division multiplexed 20-Gb/s signal, E S , at wavelength λ S = 1551 nm was generated by time-division multiplexing two 10-Gb/s RZ signals with ∼40 ps pulse width (FWHM). To generate 10-Gb/s RZ pulses, E S output from three-electrode λ/4-shifted DFB-LD [52] was intensity-modulated by the first LiNbO 3 modulator (LN-1) with a 10-GHz sinusoidal signal. This was followed by the second LiNbO 3 modulator (LN-2) intensity modulating with a 10-Gb/s NRZ data stream (PN: 2 23 − 1).…”

Section: Figmentioning

confidence: 99%

See 1 more Smart Citation

Long-Haul Fiber Transmission Using Optical Phase Conjugation

Watanabe

Kaneko

Chikama

1996

Optical Fiber Technology

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Section: Dispersion-decreasing Dcfmentioning

confidence: 86%

Section: Figmentioning

confidence: 99%

Long-Haul Fiber Transmission Using Optical Phase Conjugation

Watanabe

Kaneko

Chikama

1996

Optical Fiber Technology

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“…LDs have very fast FM modulation speed [6]; however, due to their relatively poor spectrum quality, complicated phase-locked loop (PLL) with broad bandwidth and short delay are employed to achieve a good quality heterodyning signal in the millimeter-wave domain. Most viable optical heterodyning approaches producing high-quality millimeter-wave signals employ solid-state lasers with temperature or piezo-transducer (PZT) tuning [7]- [9], both of which result in very slow tuning speed.…”

Section: Rapidly Tunable Millimeter-wave Opticalmentioning

confidence: 99%

Rapidly tunable millimeter-wave optical transmitter for lidar-radar

Vieira²,

Goldwasser

et al. 2001

IEEE Trans. Microwave Theory Techn.

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This paper reports on the optical generation of a rapidly tunable millimeter-wave subcarrier for lidar-radar. The millimeter-wave signal is generated by beating the output from two Nd : YVO 4 /MgO : LiNbO 3 electrooptical monomode microchip laser sections realized monolithically in a single composite crystal. The device has a continuous tuning range up to 45 GHz. The measured chirp rate is 3816 THz/s, the voltage sensitivity is 10.6 MHz/V, and the measured residual phase noise is 106 dBc/Hz at 10-kHz offset.

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“…The overall FM response of the laser diode at low frequencies then becomes nonuniform because the vector addition of the thermal FM and the carrier FM produces a 'dip' at around 1 MHz [13], [14]. Different approaches have been reported to combat this problem such as pre-equalization of the laser driving signal [15], the use of multi-electrode laser diodes (LDs) [16], and the use of a preamplifier with a compensation network to enhance the signal at the laser FM response dip [17]. However, these methods require either a complicated implementation or replacement of the conventional lasers with those having modified structures in order to produce a highly flat FM response.…”

Section: Introductionmentioning

confidence: 98%

Directly modulated laser transmitter driven by DC-balanced line-coded signals

Kim

2010

2010 IEEE International Conference on Communication Systems

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Directly modulated laser (DML) based optical transmitters provide cost-effectiveness, small footprint, high output power, and high reliability. However, the signal quality of the DML output is poorer than that of external modulator-based counterpart, mainly because of the frequency chirp accompanied by current modulation of DMLs. Especially, the large current modulation to achieve high extinction ratio of the output signals induces severe chirp and waveform distortion that the transmission distance is significantly limited in high data-rate systems. This can be overcome with frequency modulation of DMLs. By making good use of the frequency modulation of DMLs, not only can we reduce the driving voltage but we also substantially reduce the deleterious effects of chirped modulation. However, frequency modulation (FM)-based DML transmitters suffer from the non-uniform FM response of the laser at around 100 kHz to 10 MHz. It gives rise to severe pattern-dependent performance degradation to directly modulated baseband signals. In this paper, we investigate through experiment the use of line coding to deplete the low-frequency spectral contents of the signals and thus to alleviate the degradation. We measure the performance improvement of various line codes, including 8B/10B, 5B/6B, 7B/8B, 9B/10B, and 64B/66B, for continuousphase frequency-shift keying (CPFSK)/amplitude-shift keying (ASK) signals generated by a DML and a delay interferometer. Experimental demonstrations are performed with a long pseudorandom bit sequence length of 2 20 -1 and the bandwidth expansion by the line coding is taken into consideration. We also propose and demonstrate DML-based transmitters driven by highly band-limited electrical signals to alleviate the modulation bandwidth limitation. By using duobinary coding together with DC-balanced line coding, we generate 10-Gbps signals using a DML driven by 3.5-GHz-bandwdith signals and transmit them over 20-km of standard single-mode fiber without any dispersion compensation.

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FM response of narrow-linewidth, multielectrode lambda /4 shift DFB laser

Cited by 34 publications

References 10 publications

Long-Haul Fiber Transmission Using Optical Phase Conjugation

Long-Haul Fiber Transmission Using Optical Phase Conjugation

Rapidly tunable millimeter-wave optical transmitter for lidar-radar

Directly modulated laser transmitter driven by DC-balanced line-coded signals

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