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LC25ET Dataheets PDF



Part Number LC25ET
Manufacturers Bookham
Logo Bookham
Description 2.5 Gb/s Buried Het 4x100GHz Tunable Laser
Datasheet LC25ET DatasheetLC25ET Datasheet (PDF)

Data Sheet www.DataSheet4U.com 2.5 Gb/s Buried Het 4x100GHz Tunable Laser with Etalon Stabilisation and extended reach option LC25ET This laser module employs the Bookham gain coupled SLMQW buried heterostructure DFB laser chip, and has been designed specifically for use in Wavelength Division Multiplexed (WDM) 2.5 Gb/s long distance optical fibre trunk systems. The device is packaged in a hermetically sealed 14-pin butterfly package incorporating an isolator and locking optics to lock and stab.

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Data Sheet www.DataSheet4U.com 2.5 Gb/s Buried Het 4x100GHz Tunable Laser with Etalon Stabilisation and extended reach option LC25ET This laser module employs the Bookham gain coupled SLMQW buried heterostructure DFB laser chip, and has been designed specifically for use in Wavelength Division Multiplexed (WDM) 2.5 Gb/s long distance optical fibre trunk systems. The device is packaged in a hermetically sealed 14-pin butterfly package incorporating an isolator and locking optics to lock and stabilise wavelength and power of the laser over life. The module is tunable by means of the internal thermo-electric cooler over four adjacent 100 GHz ITU WDM channels. The device is available with a number of power options and wavelength schemes, which are customizable to individual customer specification. The internal etalon wavelength stablilisation and low chirp performance makes this product compliant with 50GHz optical channel spacing. Features: • 2.5 Gb/s Operation • Tunable over four separate channels at 100 GHz channel spacing • Integrated wavelength locking optics • Entire C band ITU wavelengths available (1528 to 1563 nm) • Narrow spectral line-width • Hermetically sealed 14-pin butterfly package with optical isolator • Internal TEC with precision NTC thermistor • Extended reach performance up to 360 km with low dispersion penalty • 50GHz optical channel spacing compliant for interlay or future upgrade • RoHS compliant Applications: • Optical Service Channel (OSC) applications in DWDM transmission systems using optical amplifiers. 1 Data Sheet www.DataSheet4U.com Parameters Parameter Threshold current (Ith) Slope efficiency 2 mW 3 mW 4 mW High Power [2] Conditions Min Typ 10 Max 22 0.09 0.13 0.17 0.43 -10 Unit mA mW/mA mW/mA mW/mA mW/mA dB V nm dB nm dB [1] 0.04 0.06 0.08 0.143 RF input reflection coef (S11) Forward voltage Peak wavelength (λp) Dispersion penalty Time averaged spectral line width Side-mode suppression Optical rise/fall time Monitor photo currents Monitor dark current Thermistor resistance Heatpump current Heatpump voltage Change of λ with laser temp. Optical spectral window 1.3 [3] [4] 1.8 1563 2 1527 -20 dB 34 [5] 0.4 40 0.6 125 40 250 360 50 ps µA kΩ mA V nm/°C nA ∆T = 64°C 8 to 50°C 4.07 20.7 1000 2.4 0.09 ∆T = 64°C Over life & temperature including chirp [6] -9 +9 GHz [1] The high power version provides 10 mW peak output power for 175 km applications and 7 mW peak output power for 360 km applications. [2] 50 Ω measurement system, f = dc - 3 GHz. [3] Submount temperature between 0°C & 40°C start of life to achieve required λp. [4] Dispersion penalty is compliant to a link length of 175 km or 360 km using an extinction ratio of 10dB. Fibre dispersion characteristics are derived from the following equation: 4 0 3 D(λ ) = where So =0.092 ps/(nm2 km) and λ0 = 1302 nm. [5] Measurements determined from 20 - 80% Pk - Pk. [6] For more information on wavelength control and drift over life refer to application note DR1670. So λ (λ − ) ps /(nm.km) 4 λ 2 Data Sheet www.DataSheet4U.com Absolute Maximum Ratings Parameter Case operating temperature Laser submount operating temperature Storage temperature Laser current above Ith Laser reverse voltage Laser reverse current Monitor diode bias Heat pump current Heat pump voltage Fibre bend radius 30 Min 0 8 -40 Max 70 50 85 100 1.0 10 -10 1 2.4 Unit °C °C °C mA V µA V A V mm Reliability/Quality Meets Qualification requirements of Telcordia / Bellcore GR468-Core for central office environment. Operating reliability <500 FITs1 in 15 years. 1 - Assumes laser die submount is held within the range 8°C to 50°C by the internal thermoelectric cooler and the product is deployed in equal quantities on each of the four channels with a mean forward current of 35 mA. End of life limits based on 10 mA increase in Ith and 25% change in laser efficiency. FIT rate data for other end of life criteria, including minimum extinction ratio requirements, are available on request. Outline Drawing Figure 1: Outline Drawing. 3 Data Sheet www.DataSheet4U.com Figure 2: Schematic Diagram. Connections Pin # 1 2 3 4 5 6 7 Function Thermistor Thermistor Laser DC bias (-) Monitor short anode (-) Monitor cathode (+) TEC (+) TEC (-) Pin # 8 9 10 11 12 13 14 Function Case ground Case ground Monitor long anode (-) Laser case ground Laser modulation (-) Laser case ground N/C Instructions for use – LC25ET Pin 1 and Pin 2 Thermistor The thermistor is used in a control loop in conjunction with the thermo-electric cooler to maintain the laser submount temperature at the required value for wavelength. Operating current should be less than 100 µA to prevent self-heating errors. Pin 3 Laser DC bias (-) Laser bias current (negative with respect to package ground) is applied via this pin which forms one side of the bias-T connection to the laser cathode. Pin 4 +10 Monitor anodes, Pin 5 Monitor cathode Monitor diodes are arranged in the package such that they give .


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