Tehcwin CKSF-D-EY-M  Erbium & Yetterbium Co-doped Fiber with  Narrow Linewidth (<10kHz) and Low Phase Noise, Low Relative Intensity Noise (RIN) Single Frequency Fiber Laser for Coherent Optical Fiber Communications

Techwin CKSF-D is a low-noise Single Frequency Fiber Laser based on Distributed Feedback Bragg Grating (DFB) technology. It has independent intellectual property rights and achieves a stable single-frequency laser output with single longitudinal mode, linear polarization, and narrow linewidth. CKSF-D has very low phase and frequency noise and low relative intensity noise (RIN). Techwin uses unique packaging technology to ensure low-noise DFB single frequency fiber lasers with excellent wavelength stability.

Techwin uses extra-cavity technology to significantly suppress the relative intensity noise (RIN) of the DFB single frequency fiber laser, ensuring that the resonant cavity of the single frequency fiber laser is not disturbed. Please refer to CKSF-D-RS series products.

CKSF-D narrow linewidth single frequency fiber laser module has a small size, a sturdy package, strong resistance to environmental interference, and an output power of more than 100mW. CKSF-D-EY-M is based on Erbium & Yetterbium co-doped fiber with narrow linewidth (<10kHz) and low phase noise, low relative intensity noise (RIN). The standard wavelength is 1550.12nm, and the optional wavelength range is 1530-1570nm, such as the standard wavelength under the ITU framework. Other wavelengths can be customized according to requirements.

Coherent optical fiber communications were studied extensively in the 1980s mainly because of the high sensitivity of coherent receivers that could enhance the unrepeated transmission distance ; however, since 1990, related research and development had been interrupted by the rapid advances in high-capacity wavelength-division multiplexed (WDM) systems, which employed the conventional intensity-modulation and direct-detection (IM·DD) scheme as well as the newly developed erbium-doped fiber amplifier (EDFA) to compensate for span loss of the link. In 2005, the demonstration of digital carrier-phase estimation in coherent receivers led to the renewal of widespread interest in coherent optical communications. The reason is that the digital coherent receiver enables us to employ a variety of spectrally efficient modulation formats such as M-ary phase-shift keying and quadrature-amplitude modulation (QAM), relying upon stable carrier-phase estimation in the digital domain. In addition, because the phase information is preserved after detection, we can equalize linear transmission impairments such as group-velocity dispersion (GVD) and polarization-mode dispersion (PMD) of transmission fibers via digital signal processing(DSP).

Features:

l   Ultra-narrow linewidth <1kHz

l   Very low phase noise and frequency noise

l   Low relative intensity noise (RIN)

l   Stable single frequency, single polarization output

l   No mode-hopping

l   Small sized package 145x100x25mm

l   High reliability

Applications:

l   Distributed optical fiber sensing

l   Coherent LiDAR

l   Fiber optic hydrophone

l   Laser spectroscopy

l   Coherent communication

l   Gas absorption measurement

l   Cold atomic physics

l   Other scientific research

Specifications:

 

Parameter	Unit	Specification
		Min	Typ.	Max
Part no.		CKSF-D-EY-M
Center wavelength	nm	1530-1572nm fixed, other specify
Output power	mW	5	50	100
Laser output		CW, Single frequency & Single longitudinal mode
Beam quality	M2	-	1.05	1.1
Linewidth	kHz	-	8	10
RIN peak frequency	kHz	500	600	700
RIN peak	dBc/Hz	-	-115	-110
RIN @10MHz	dBc/Hz	-	-140	-135
Phase noise (1m OPD)	urad/√Hz	80@100Hz
	urad/√Hz	7@10kHz
	urad/√Hz	0.7@100kHz
SMSR (50pm resolution)	dB	60	>70	-
Output polarization		Linear
Polarization extinction ratio (PER)	dB	20	23	-
Output power stability	%	-	0.5	1
Output isolation	dB	50	-	-
Wavelength thermal tuning	nm	0.6	0.8	1.0
PZT wavelength modulation		Optional
Modulation frequency (linear)	kHz	DC	10	20
Modulation wavelength range	GHz	-	>8	>10
Operating temperature	℃	0	-	60
Storage temperature	℃	-40	-	85
Power supply	VDC	12
Communication interface		RS485
Output fiber type		Panda PM1550
Output fiber length	m	> 0.5
Optical connector		FC/APC
Dimension	mm	145x100x25
Weight	kg	<0.5

 

	Ordering Information: CKSF-D-EY-M-<15xx>-<PW>-PMF/SMF-PZT-FA  PW: Output power, 5- 20mW is fixed, 50mW and 100mW output power are adjustable Options:  1. SMF output 2. Monitoring output 3. PZT fast modulation