Optoplex Tunable Optical Filter - Optical Tunable Filter

Product Description - Tunable Optical Filter

Optoplex's Tunable Optical Filter, also known as Optical Tunable Filter or Tunable Bandpass Filter, is an integrated module, consisting of micro optics and electronics. When receiving a stream of optical signals of a plurality of wavelengths from the Input-Port (IN), the 2-port tunable optical filter directs a selected channel to the Output-Port (OUT). The selected channel can be varied (tuned) within the operating wavelength (frequency) range by a remote command sent through the built-in control PCB and firmware.

Optoplex's Tunable Optical Filter is based on a patented micro-optic design and thin-film interference filter coating technology. The thin-film filter used in tunable optical filter is very similar to those already widely used in DWDM devices. The wavelength tuning is achieved by varying the incident angle of the incoming light beam on the thin-film filter. Each single device is optimized to cover either C- or L-band wavelengths. The standard tunable optical filter product family supports 100- and 50-GHz channel-spacing.

For 3-port tunable optical filter, please visit Reconfigurable Optical Add/Drop Multiplexer (ROADM) page.

Schematic diagram of Optoplex 2-port tunable optical filter

Features and Benefits of Tunable Optical Filter

Athermal Design
Wide Tuning Range, Cover C-Band or L-Band
Flat and Wide Passband for up to 40 Gb/s Signals
Low & Uniform Insertion Loss
High Channel Isolation
Latching and Low Power Consumption
Options of Electrical Connector from Side or Bottom
Support Both TTL and LVTTL
3-Port ROADM Device Available
Telcordia GR-468 Qualified

Applications of Tunable Optical Filter

Dynamic wavelength selection in DWDM systems
Signal demultiplexing for DWDMs
Optical performance monitoring
Tunable optical noise filtering
Noise suppression for optical amplifiers

Standard Specifications of DPSK Demodulator

Parameter	Unit	50 GHz	100 GHz
Wavelength Tuning Range	nm	C-band: 1528 ~ 1562 L-band: 1567 ~ 1603
Wavelength Tuning Resolution	THz	~ 10 pm or Calibrated to ITU grids
Passband Width¹ @ 0.5 dB	GHz	-	>30
Passband Width¹ @ 1.0 dB	GHz	>16	-
Passband Width¹ @ 3.0 dB	GHz	25 (Typical)	50 (Typical)
Passband Width¹ @ 20 dB	GHz	< 85	-
Passband Width¹ @ 25 dB	GHz	-	<150
Peak Insertion Loss¹ (without connector)	dB	<5.0	<3.0
Polarization Dependent Loss¹	dB	<0.3 within CW±5GHz	<0.4 within CW±10GHz
Polarization Mode Dispersion	ps	0.5	0.3
Chromatic Dispersion¹	ps/nm	<± 100 within CW ±5GHz	<± 50within CW ±12GHz
Wavelength Setting Error²	GHz	<±4
Wavelength Repeatability²	GHz	±1
Wavelength Temperature Dependence	pm/°C	<± 1 (Typical)
Return Loss	dB	> 40
Maximum Input Optical Power	mW	300
Tuning Speed (channel to channel, depending on originating and destination channels)	sec	<10	5 ~ 10
Tuning Power Consumption	mW	<1800 (Peak); <300 (Idle)
Tuning Voltage	V	5 (DC)
Electronic Interface	mW	RS232
Operating Temperature	°C	0 to 65
Storage Temperature	°C	-40 to 85
Dimension(L x W x H)³	mm	84 x 61 x 16

Notes:

Over the stated spectral and operating temperature ranges and all polarization states.
Related to mechanical accuracy at a given temperature.
Including collimator sleeve and control PCB.

Typical Performance of Tunable Optical Filter (100 GHz)

Typical spectra of Optoplex 2-port tunable optical filter

Temperature performance of Optoplex 2-port tunable optical filter

Parameter Definition of Tunable Optical Filter

Parameter Definition	Example
Wavelength Tuning Range (nm) is the spectral range over which a tunable optical filter's center wavelength can be tuned and performance specification can be met..	1527.994 ~ 1563.047 nm
Wavelength Tuning Resolution (GHz) is the minimum tuning step of a tunable filter.	10 pm
Passband Width @ X-dB Down (GHz) is the full spectral width centered at the ITU grid measured at X-dB below the minimum insertion loss point. Usually, X = 0.5, 1, 3 and 20.	35 GHz @0.5-dB down for 100 GHz channel spacing
Peak Insertion Loss (dB) is power difference between the 0-dB level and the maximum power level measured within a given passband window.	2.5 dB
Polarization Dependent Loss (PDL) (dB) is the difference between the maximum and minimum insertion loss over all polarization states within a given passband window.	0.3 dB within CW ± 12 GHz
Polarization Mode Dispersion (PMD) (ps) is the maximum Differential Group Delay within a given passband width.	0.3 ps
Chromatic Dispersion (CD) (ps/nm) is the derivative of the Group Delay versus wavelength within a given passband width.	± 25 ps/nm within CW ± 12 GHz
Wavelength Setting Error (GHz) is the difference between a channel central wavelength (usually defined using 3-dB bandwidth) and the target wavelength (usually the ITU grid) during tuning.	± 4 GHz
Wavelength Repeatability (GHz) is the repeatability of a channel central wavelength (usually defined using 3-dB bandwidth) during repeated tuning.	± 1 GHz
Wavelength Temperature Dependence (pm/°C) is the rate of a channel central wavelength versus temperature.	± 1 pm/°C
Optical Return Loss (dB) is the ratio between the input power and the reflected power over all polarization states at each port , RL = -10×log₁₀(Pr/Pin).	40 dB
Tuning Speed (s) is the time needed by a tunable filter to tune from one channel to another. It is dependent on the originating and destination channels. The longest time required is specified.	6 s
Operating Temperature (°C) is the ambient temperature range over which the device's performance spec can be met.	-5 to 65 °C
Storage Temperature (°C) is the ambient temperature range over which the device can be stored without affecting its intended application afterwards.	-40 to 85 °C