Product Focus: lasers

111509

Analogue, modulated lasers target cable TV market

Excelight Communications has two new versions of the Sumitomo Electric 5416 direct modulated laser diode module. They have a 14-pin butterfly package with an integrated TEC, built-in optical isolator, and single-mode fibre pigtail. They are available in C-band frequencies at 100GHz channel spacing for cable TV DWDM applications:

  • A new higher-temperature version of the standard SLT5416 for digital return path is directly modulated up to 2.5Gbit/s. The standard laser is suitable up to 1800ps/nm (110km), with extended reach versions for both 2400ps/nm (150km) and 3200ps/nm (200km). Peak power level options include 2, 10, and 20mW.
  • The SLV5416 adds analogue characteristics for QAM narrowcast forward path and QAM trunk line return path applications. It shows good distortion performance when using NTSC 8-channel loading over 40km of standard non-dispersion-shifted SM fibre. Modulated power level options include 6, 8, and 10mW.
www.excelight.com

Applied Optoelectronics Inc 's 1550nm analogue lasers are optimised for the demanding distortion requirements of CATV.

For forward-path applications, the DFB-1550-BF-XX-A3 series offers up to 13mW of output power in a 14-pin butterfly package. They are designed to carry 77 channels, NTSC; or 60 channels, in PAL-D format.

For the reverse path, the DFB-1550-C5-2-A series of coaxial-packaged lasers features low distortion performance. www.ao-inc.com

JDS Uniphase's CQF 310 is a CW DBR source laser with 20mW output power that is tunable over 24x50GHz (a quarter band).

It is available in eight wavelength ranges covering the C and L bands.

Also, the CQF 478 is a 20mW, 8x50GHz, CW temperature-tunable laser with an integrated etalon-based wavelength locker that can reduce source laser sparing and inventory for metro, hybrid fibre-coax and cable TV applications
www.jdsu.com

Quantum Devices Inc's wavelength selectable laser chip is a high-power monolithic temperature-tunable 1550nm InP 8-element DFB laser array chip. It is integrated with a combiner and a semiconductor laser amplifier.

Output power is >40mW, SMSR >40dB and relative intensity noise (RIN) <-138dB/Hz with a cumulative tuning range of 25nm or 60 ITU wavelengths at 50GHz spacing.
www.qdi-usa.com

Santur Corp's TL1020-C laser tunes across 36nm (the entire C band) and has the functionality of variable optical attenuation to provide 20mW mode-hop-free without the use of a semiconductor optical amplifier.

The simple design of the DFB array and low-loss coupling scheme enables pure DFB performance.

The module also integrates a wavelength locker for ultra-stable ITU grid operation down to 25GHz channel spacing, and includes built-in control electronics and software for simple interfacing.

Santur has also sampled L-band versions.
www.santurcorp.com

Based on its Erbium Micro Fibre (EMF) technology, NP Photonics' SMPF-2030 is a fixed-wavelength fibre laser module with narrow linewidth of <10kHz, mode-hopping free, and an SMSR of >50dB.

Relative intensity noise is <–140dB/Hz at 2MHz. The laser is available at ITU 50GHz for the entire C-band and has wavelength accuracy of ±500MHz.

The module includes embedded microprocessor control and a 1m-long PM fibre pigtail connector with a jacket diameter of 250 or 900µm.

A single-mode diode laser provides the high-reliability pump power of 30mW to drive its erbium-doped micro fibre in a single integrated package of just 168x70x19mm.

NP Photonics will also develop a tunable version for metro applications.
www.npphotonics.com

Applied Optoelectronics Inc's cooled 1310nm DFB lasers offer output powers up to 25mW and distortion characteristics of CSO <-57dB, making them suitable for both forward- and return-path CATV applications.

The DFB-1310-BF series has a standard 14-pin butterfly package with OC-48 pin compatibility. Integrated isolators resist signal distortion over links beyond 40km.

For intermediate- and long-reach, digital versions can be directly modulated at 2.5Gbit/s and analogue versions can carry a full channel count in forward-path applications at 50–860MHz.
www.ao-inc.com

In Lumics' second-generation LU0980S pump laser chip series, the LU0980S500 provides operating power of up to 500mW (600mW kink-free) and will be used for cooled operation in a standard 14-pin butterfly package. The chip is mounted on a 2x2.3mm ceramic sub-mount.

Forward voltage is only 1.65V at operating conditions (Iop, Top). Threshold current is specified with a maximum of 58mA. Its typical operating forward current is 550mA.
www.lumics.com

Santec's SweptX swept laser system tunes through 40nm in 2.5s. Precise control of laser wavelength and stability gives a measurement resolution of 1pm. Integrated wavelength and power meters enable speedy and accurate measurement of passive optical component performance.
www.santec.com

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