The Thorlabs' TOF1550 is a tunable Gaussian bandpass filter designed to operate with telecommunication C-band (1527 - 1567 nm) signals on a dense wavelength division multiplexing (DWDM) ITU grid. The center wavelength of the bandpass can be tuned to any position within the operating wavelength range by selecting either the wavelength directly or a channel on the ITU grid. If multiple DWDM channels are input into the filter, only the selected channel will be transmitted while all others will be blocked. If a broadband optical signal is input, only the passband around the center wavelength will be transmitted. The filter can also be used in a laboratory or production environment as an aid in optical signal selection, monitoring and diagnosis of an optical communication system, characterizing spectral response of detection or amplification systems, or an amplified stimulated emission filter to enhance a laser's signal-to-noise ratio.
Features
- Tunable, Gaussian Bandpass Filter for C-Band Operation
- FC/APC Narrow Key (2.0 mm) Fiber Input and Output
- Ideal for DWDM ITU Grid Channel Spacing Applications
- <3.5 dB (2.5 dB Typical) Insertion Loss at 1550 nm
- Remote Operation Through USB Type-C Port
Applications
- Dense Wavelength Division Multiplexing (DWDM)
- Spectral Response Characterization
- Out-of-Band ASE Suppression
- Receiver Testing
Passband Tuning
The TOF1550 touchscreen allows the target center wavelength "λc" to be specified either directly within the operating range of 1527 - 1567 nm or by selecting a desired ITU grid channel from 14 to 63. This passband can then be adjusted using the "Step" up and down arrows. The step size for the wavelength or channel can be adjusted in steps as small as 1 pm or 0.01 channel (1 GHz), respectively, though the tuning resolution of the TOF1550 filter passband is <12 pm (1.5 GHz). See the Operation tab for more details on adjusting the filter parameters and the Specs and Graphs tabs for more details on the tuning parameters and performance.
Remote Operation
In addition to operating the TOF1550 bandpass filter using the touchscreen interface on the device, the USB Type-C port and the included corresponding USB cable can be used to remotely operate the filter. See the Operation tab for more details. The TOF1550 filter will appear as a serial (COM) port which can be accessed and run using the supplied driver. Any computer that can communicate via a serial port can operate the filter remotely.
The functions of the TOF1550 digital tunable bandpass filter is shown above. An input optical signal is input using the narrow-key FC/APC fiber port and is then filtered based on the setting given using the touchscreen on the device or using the remote commands. The filtered signal is then output through another narrow-key FC/APC fiber port.
Learn more here.
| Key Specifications | |
|---|---|
| Wavelength Tuning Range | 1527 - 1567 nm |
| Passband Width @ -1 dBa | ≥0.12 nm (15.0 GHz) |
| Passband Width @ -3 dBa | ≥0.21 nm (26.2 GHz) |
| Passband Width @ -20 dBa | ≤0.77 nm (96.1 GHz) |
| Insertion Lossa,b,c | <3.5 dB (2.5 dB Typical) |
| Polarization Dependent Loss | <0.3 dB |
| Non-Adjacent Isolationa | ≥27 dB |
| Maximum Input Power | 300 mW (24.78 dBm) |